As Nyssa approached the two, the Doctor motioned for her to keep her distance. "This is the Celestial Toymaker. He's behind all this. He's a very powerful being, and he likes to play games with mortals for his amusement."

"Is he worse than the Master?" Nyssa asked, already guessing the answer.

"Very much so." The Doctor faced the Celestial Toymaker. "I'm going to need you to release the Concorde passengers."

The Doctor said this with rare force and gravity, and the Celestial Toymaker ignored the tone altogether. "Oh, those shadows. How strange that you have such an interest in them. This is the game, Doctor, you know the rules. I have placed you in a trap, you must find the way out. If you fail, all sorts of undesirable things may occur. You may keep me company for an eternity after the shadows have all vanished, one by one. I bid you au revoir. For you shall see me again."

And with that the Celestial Toymaker disappeared. The Doctor grimaced, then turned around. "Let's get back to the TARDIS. There's nothing we can do here."

The Concorde

Meanwhile Tegan was wondering how to deal with the impressively malevolent dinosaur that had just appeared. She certainly didn't have any experience dealing with them, and it occurred to her that in the little reading she had done on the subject, this particular kind of dinosaur had never appeared. Nevertheless, while this species had never been lucky enough to be fossilized, this particular specimen looked more than capable of having several Victor Foxtrot passengers for dinner.

Tegan gritted her teeth and braced herself, desperately trying to guess her next move. Suddenly there was a loud high-pitched shriek. The dinosaur yelped in pain, and quickly dashed off in the other direction.

"What the hell was that?"

"It came from the cockpit," June realized. And indeed, Madhabi up above opened a cockpit window. "Turns out that one loud squawk is enough to turn them away."

"You can't use the sound system like that," Bilton objected. "For a start, you'll wear out the power."

"But this plane isn't going anywhere," Madhabi properly pointed out. "We've cannibalized it so that Alpha Charlie can take off."

Captain Stapley and Scobie appeared. "All the more reason to get moving. We can't assume they won't come back, or that there aren't other dinosaurs, some of which might actually like the audio system. Is everything working, Bilton?"

"Almost. There's only one problem, though, Skipper. We'll need some compressed air for the start-up."

"I'll take the tires off numbers one and four wheels from Victor Foxtrot." Stapley replied.

"Sir, that makes no sense,"

"Skipper, have you any idea how you jack up a hundred tons of aircraft?" Scobie pointed out.

Stapley did not. But June did. "We dig a hole."

"And with three and two wheels still in place, you don't need to support the aircraft!"

"I say, brilliant," Bilton added, all too relieved.

The Doctor was preparing to leave the null space and return back to the Jurassic. Just then Nyssa realized that in this space she could be able to remember more of the other place. "Ad…" she gasped, but then the column motor started to go up and down.

Nyssa cursed herself at her stupidity. But then the Doctor spoke up. "Some good news!"

"What?"

"We still can't move out of the Jurassic period. But I can physically move the TARDDIS from one place to another within it. That would be helpful in getting close to Alpha Charlie."

And then Nyssa found herself back in the garden. There were a whole host of birds, circling around in the sky, with "Debbie" not necessarily being the leader. The air was filled with a strange atonal triumph of music. And then Adric touched her.

"Nyssa, listen very carefully. The birds are singing, and I'm not quite clear what they're doing. But it's clearly helping. I've just had this brilliant intuition, and you need to tell the Doctor it when you next see him." And he whispered a word into her ear.

And then she was back on the TARDIS. "Vector, Doctor. Vector."

The Doctor was surprised, then an idea occurred to him. He smiled.

Meanwhile the others were all very busy preparing Alpha Charlie. Tegan, Madhabi and June were all occupied with getting the passengers' luggage on to it.

"Excuse me," an elderly female passenger asked, "but is there going to be any food?"

"Now that's a thought," Tegan replied. "Come to think I haven't eaten anything since Adric…" But then she stopped herself.

But just then a thin male passenger in his early thirties spoke up. "Actually, this Chinese person has been handing out these really excellent lamb sandwiches. Also soda pop as well."

"This Chinese person?"

"There weren't any Asian people on the plane," Madhabi whispered. "Except for me."

"Well he was certainly dressed very Chinese," the second passenger replied. "The odd thing is that he was speaking with this very posh accent. Almost All Souls in fact. Said that we would either be in London in an hour, or we'd all be dead. Oh well."

The Doctor was sitting on the floor, along with Nyssa, along with some paper and a host of measuring tools near the TARDIS console. "Bother!" he muttered.

"Excuse me?"

"The Celestial Toymaker has been very clever. If I connect the TARDIS with an object with a certain mass and a certain velocity, we can start to leave the Jurassic."

"A certain object, like the Concorde?"

"Actually the minimum weight and velocity would be half that. But since we're 140 million years in the past, we have strictly limited options. So we can start to leave this time period. But before we get any further, I have to solve some of the Toymaker's puzzles."

"How many, Doctor?"

"I don't know. It could be one, it could be one thousand, it could be one million. It's completely up to him. What I do know is that I have a limited amount of time to solve them all. Seventeen minutes and twelve seconds. So if I don't solve any of them at all, the window of opportunity will shut down, and the Concorde will have to land. And since there are no runways in this period, at best we will seriously damage the landing gear. Probably making it impossible to take off again. But if I solve one puzzle, but not the next, or I solve that one, but fail to solve one further down the line, the Concorde will be moving through time when our time runs out. And all sorts of worse things could happen to it, like its immediate destruction."

Nyssa grimly nodded. "We should take the passengers in the TARDIS so at least they'd be safe."

"Unfortunately, this temporal Mobius strip has a nasty side effect. While we and Tegan can use the TARDIS, anyone else trying to use it to travel in time for the first time will have something nasty and lethal happen to them."

"Take them all to the null zone. We strictly speaking wouldn't be moving in time. And we could pick them up instantly once we solved the problem."

"I thought of that. And so has the Celestial Toymaker. He's put an override on the TARDIS."

"Don't use the Concorde at all. Instead, move along the vector by ejecting the TARDIS rooms, like we did just before we arrived in Castrovalva."

"I thought of that as well. I was just doing the math, and it almost works. No, it looks we have no choice but to play the Celestial Toymaker's game, while putting everyone else in mortal peril."

The Doctor got up and quickly rematerialized the TARDIS near Alpha Charlie. Scobie was busy topping up the break line fluid. Stapley approached the Doctor. "Doctor, I shall need an external power supply to start the engines. Four hundred cycles, a hundred and fifteen volts."

"Right. I'll run a line from the TARDIS. I'll also take another line that I'll connect to the flight computer. Without the forklift back at Heathrow, I can't easily get the TARDIS back into Alpha Charlie. And it would probably be better if it wasn't in it anyway. The line to the flight computer should still help create an electronic connection, allowing the Concorde to move in time."

The crew and the Doctor quickly made progress getting everything ready. Soon Tegan was making an announcement. "Ladies and gentlemen, we do apologize for the delay. Your flight is now ready for boarding. Would you care to proceed to your aircraft immediately?"

Nyssa took Tegan aside. "The Doctor has a special task for you." Soon, they were both back in Tegan's bedroom in the TARDIS. On her desk were some devices, one of which looked like an old-fashioned short-wave radio transmitter.

Nyssa sat Tegan down and put some earphones on her. "You are going to talk to the crew while I and the Doctor arrange the TARDIS' flight. If there are any problems the Doctor will be able to hear you in the control room."

"Can you hear me, Captain Stapley?" Tegan asked.

"Perfectly, Tegan," he replied. "Get Madhabi in here." Madhabi quickly ran to the plane and got on board. "Start number one engine. Start number four engine. I want reverse thrust on three and four so I can turn the aircraft and clear that ramp." The Concorde began to taxi. "Ladies and gentlemen, fasten your seatbelt for takeoff, please." Now Stapley spoke to the crew. "At V two, we'll maintain our climb-out at theta two, at full power. Cross your fingers. This is it, gentlemen. Three, two, one, now."

Meanwhile, near the console, the Doctor and Nyssa were preparing the TARDIS, and could hear everything. The Doctor turned down the volume. "I'm going to need to concentrate. The sensors should detect any problems well before the crew notices them."

"Tegan isn't going to be happy if you fail to save her friends."

"I know. Nor should she be."

The Concorde ran down the Jurassic equivalent of a runway. It was a rough ride.

"Power checked," said Scobie.

"V one. Rotate," added Bilton. Stapley pulled up the controls and Concorde lifted into the air. "What did I tell you, Doctor? Finest aircraft in the world."

The Doctor was not really listening. Instead, he waited for a click, which started in a few seconds once the Concorde had reached a certain velocity. Both he and the Nyssa saw a display with the numbers "17:12" start counting down. "There's going to be a lot of information appearing on this screen. It appears in complex notation, but basically it will appear in the form of a puzzle. I can then answer the puzzle, by replying in mathematical notation."

"Doctor, the time motor's moving."

"Ah. That means the Celestial Toymaker is not going to allow the Concorde to land in the Jurassic if I don't get the first puzzle."

Tegan interrupted from her bedroom. "So far, everything's fine on the Concorde."

"Thank you, Tegan," the Doctor replied. There was now less than sixteen minutes. The Doctor paced a little nervously. Now there was less than fifteen and a half minutes.

"All right, the information is appearing on the screen. But… but… it's incomplete!"

And then Nyssa found herself back in the garden. "Debbie" was speaking to her. "Listen very carefully. There are eight puzzles the Celestial Toymaker wishes you to solve. Each puzzle is split in half, one here, one in the TARDIS. You must see the puzzle whole, so that the Doctor and Adric can each solve four." Nyssa looked around her more closely. The birds were flying in the air, singing a strange atonal music that might have alarmed most humans, but impressed itself on Nyssa with its beauty and majesty. Nyssa realized that the music was being sung so that she could communicate between both worlds. Nyssa looked more closely, and saw Adric working furiously on his makeshift abacus.

"Doctor!" she said, back in the TARDIS. "You need to take an equilateral triangle and split it into polygons than can be combined into a square." The Doctor looked up, for a few seconds was puzzled, and then dashed out of the room. Then he came right back with a notebook. Quickly he drew an equal-sided triangle. He thought for a few seconds, then bisected two sides. He drew a line from one of the divisions equal to the bisected line. He then made two arcs and quickly drew some more lines. Soon he had three quadrilaterals and a triangle, and when he cut them he had a daisy chain of four polygons which fit together in a square. He quickly typed in the relevant mathematical information. Soon new data appeared on the console.

"Doctor," Tegan spoke up, "the Concorde's facing some turbulence." And indeed back on Alpha Charlie, Madhabi and June could not hide their concern, though fortunately they could not be seen by the rest of the passengers.

The Doctor quickly looked at the dials and gauges. "Tell Captain Stapley it's ordinary turbulence. There's nothing wrong here." "Yet," he muttered to himself.

And then Nyssa found herself in the Garden again, looking at Adric and his abacus.

"Adric! You must find a way of taking eight eights, and combine them to make a thousand. Standard Base Ten arithmetic."

Adric pondered the problem. "Debbie" helpfully dropped a notepad nearby him. But he didn't need it yet. "888 plus 88 plus 8 plus 8 plus 8 make a thousand." He quickly "entered" the solution on the abacus. Then the abacus beads moved of their own volition, as the new data appeared.

Now Nyssa was back in the TARDIS, and the Doctor was very concerned. "I don't understand it. The data that just appeared on the computer screen abruptly vanished. And now new data is appearing."

"Don't worry about it, Doctor. There's a new puzzle for you. You have ten sacks of crowns, i.e. the British coin. Each sack has ten crowns within it. But in one of the sacks, all the crowns are counterfeit. A counterfeit crown weighs a gram more than a real one, whose weight you know. You have a scale, but it will only work once. How do you find the counterfeit sack?"

The Doctor pondered this, and Nyssa nervously watched the seconds tick by. "Easy! You take a crown from the first sack, two from the second, three from the third and so on, until you have ten from the tenth, for a total of fifty-five crowns. I know the weight of a real crown, so the counterfeit sack is the one 'X' grams more than the proper weight." The Doctor started typing the answer in.

"Rather complicated trying to type this in proper notation though," he said with some frustration. The seconds passed by, and then the Doctor stopped. The data on the screen disappeared, but nothing happened.

"Are you sure you got the answer right?" Nyssa wondered.

"Of course I'm sure."

Meanwhile back on the Concorde, a passenger stopped Madhabi. "What's that happening outside? I'm not liking the looks of that."

Madhabi took a peek, and clearly saw strange, unusual atmospheric changes, the result of the Concorde travelling in time. "You haven't travelled on the Concorde before have you?"

"No."

"The Concorde does fly much higher than other planes. But I'm sure there's no need to worry. I'll just ask the captain." Madhabi calmly walked away, and then dashed to the cockpit once the passenger couldn't see her. "What's going on?" she hissed.

"That's what I'd like to know." Bilton replied. "Tegan, ask the Doctor what's going on."

"Doctor, the crew are wondering what they're seeing."

"It's a standard time travel effect. Tell Stapley to have the passengers close the windows."

Captain Stapley spoke up. "The same problem that forced the previous flight to land is causing some strange effects. Heathrow has just asked us to close all the windows for national security reasons. This should be for just a short while. We should be on the ground in less than twenty minutes."

The Doctor was not really paying attention, and was waiting for the new data to arrive. Finally, as he tapped his fingers impatiently, it arrived.

"More gibberish, I'm afraid. I'm glad you can figure this out, Nyssa."

And then Nyssa was back in the garden again. "Keep calm," said "Debbie." "Relax. You are an extremely intelligent woman. The problems will come to you."

Nyssa looked at the abacus, and the whole question appeared to her. "Adric, here is the question. What is the smallest integer that is not only the sum of the cubes of two integers, but also the sum of the cubes of two completely different integers? All positive numbers of course."

Adric thought about it. It did not take him long to answer. "1729!" he replied, as he entered the answer into the abacus. "It's the sum of both ten cubed and nine cubed, but also twelve cubed and one cubed."

Now Nyssa was back on the TARDIS. She knew that Adric was right. But the Celestial Toymaker was not hurrying with the new information. She looked at the clock: 7:45, 7:44, 7:43. Half the puzzles left, but with less than half the time.

Suddenly there was an extremely annoying, not to mention alarming, high-pitched shriek. Not only was it in the TARDIS, but in the Concorde as well. "Doctor! What the hell is that noise?" Tegan asked.

The Doctor noticed a light blinking on the console. "Hold on, let me think." He took the notebook, and did some calculations. "Ah yes, the travel in time is interfacing with the local electro-magnetic transmission. Purely an incidental process. Nothing to be alarmed about."

"Can we turn it off?" gasped an understandably desperate Tegan.

"Tell Captain Stapley that a recording of the Marseillaise will cause the dissonances to naturally resolve themselves. Or you can sing it." As it happened, the Concorde did have local songs of the countries it landed in on its sound system. Soon, the French national anthem was heard and the shrieking stopped.

Now the clock read 6:51, and new data appeared. The Doctor quickly tried to read it and did not notice a faraway look on Nyssa's eyes, as if she was somewhere else entirely. As indeed she was.

"Doctor! Assume you have twelve equally long objects. They can be matches, toothpicks, pieces of string, or locomotive engines. Use twelve of these objects to construct an object with an area of four of them."

The Doctor pondered the idea. "Hold on. Area of four with a perimeter of twelve. If I make a right angle triangle with base four and height three, the Pythagorean theorem says the hypotenuse will be five. So the perimeter will be twelve. Of course the area will be six: three by four divided by two. But-," and all this time the Doctor had been making a triangle with a dozen toothpicks that had been in one of his pockets, "-if I move these two toothpicks on the base up the level of the first vertical toothpick, and then move that toothpick to connect the two back to the old base, I'll have removed a rectangle, two by one, leaving four."

He quickly started typing the solution back on the console. It wasn't the actual problem that took so much time as in the difficulty of entering the solution in proper notation, along with the delay in providing the sixth problem.

"Come on!" he shouted.

And then Nyssa was back in the Garden, and looking at the abacus. "Adric. Listen carefully. You have three bags filled with marbles. One bag is filled only with black ones, one filled only with white, and one filled with both. All thee are labelled: black, white and mixed. But none of the labels match the bag's contents. You can only take out one marble at a time. How many times must you do so to show which bag has which contents?"

Adric thought about the problem. It did not take him long to snap his fingers. "Once. If I take a marble from the supposedly mixed bag, it will actually be the bag of the color the marble is from. Because all the labels are incorrect, the opposite color isn't in its own bag, but in the first color bag. Which means the mixed bag must be in the one supposedly labelled the second color."

He quickly started entering the information on the abacus, and again, it took a frustratingly long time. Now Nyssa was back in the TARDIS.

Then Bilton spoke up: "Sir! The radio navigation's working!" Meanwhile back at Heathrow Air Traffic Control, Alpha Charlie appeared on radar. "Look!" Air Traffic Controller Horton pointed.

Security head Sheard was stunned: "It's not possible! From out of nowhere."

"Speedbird Concorde Golf Alpha Charlie."

Stapley was justifiably smug, "Roger. Speedbird Concorde Golf Alpha Charlie descending to three five zero. We're back!"

"YES!" Tegan shouted from her bedroom, as she clapped her hands in triumph.

"Not quite," the Doctor explained to Nyssa. "This is the most dangerous part of the flight. Essentially what we've done is like a slingshot. We've apparently returned the Concorde 140 million years. But if we don't solve the last puzzle or puzzles, the 'slingshot' will be released and the Concorde will be flung back hundreds of millions of years. Maybe even billions. It could end up at a time when there's no oxygen in the atmosphere, or when the entire planet is covered in ice. And the speed involved could simply dash the Concorde to pieces against the past. Nor would there be a way for me to find it again."

In the garden, Adric was still working on his abacus. But there was something more. The birds were still singing. A quartet of peacock-like birds had taken flight, and were rising up above him, flying to the left, while a quintet of bird-of-paradise-like fowl were approaching them from the right. There was another group of birds that flew through the line where the first two groups were about to meet. They were vaguely like penguins, except that they could fly and they were green. While the overall song was one of austere atonal majesty, the green "penguins" had a lighter tone, like happy innocent children.

Debbie was speaking. "On earth, there is a phrase, 'the music of the spheres,' an idea that came when they thought their planet was the center of the universe. And you can grasp that. Your mathematical knowledge can grasp the harmonies of music, because you understand the mathematical relationships both behind the cosmos and behind the music."

"It's incredible. It's so beautiful."

"And I know, you are not fully accepting the experience. It's a very rare experience, few have the privilege of getting it. It's because you are concerned about the puzzles, which you have to solve to help the Doctor and your friends."

"If only I could get all the information, instead of only half of it."

"But what I am about to suggest is to you is something more. A couple of centuries ago, some human philosophers wondered about how much was real, and how much could be grasped through our sensory impressions of that reality. And if our senses are how we interact with that reality, perhaps those impressions are in a way more real than 'reality' itself. The music you are listening to is stranger than anything you have ever heard before, or anything that humans have ever heard. But it is still music, still based on mathematic principles of sound, as interpreted by the auditory systems of organic beings. There are a whole host of organisms with different musical ideas. The Doctor is aware of a species whose music is much longer than those humans experience. You could hear this music, and so can Nyssa, but humans can't grasp its full beauty and power because their ears are incapable of hearing that level of vibration. And yet it is unimaginably greater than any human music.

"But what if I were to tell you that there is a music beyond sound, beyond perception, even beyond mathematics? A music with a beauty beyond judgement and ideologies? Because there is. It is of a purity that cannot even be easily conceived. There is so little in your experience to truly appreciate its content. When you think of it, it's almost totally gratuitous. But I can whisper it to you. Not into your ears, where it will have no effect. But somewhere deeper, somewhere special…"

Meanwhile, Nyssa was back on the TARDIS, and looked at the time. It read 1:47. Two more puzzles left.

Slowly more data began to appear. Was that going to be quick enough? And then suddenly Nyssa found herself back in the garden. Did she will herself there? But then she realized the seventh puzzle.

"Adric, a human chessboard has 64 squares. Let's take some dominos. Each one covers two squares. If you take the top square from the top left hand corner and from the bottom right hand corner, how many dominos can you fit on the 62 remaining squares?"

Adric again pondered a puzzle. "Thirty. Each domino covers two different colors. But the two squares you mention have the same color, so there are only thirty of that color." He quickly started entering the information on the abacus. Again, it was unusually complicated to do so. Nyssa pondered that, while back on her native (and now destroyed) Traken, although it had long mastered the art of making clocks, the serenity of it was such that there was little need to have watches or to constantly check the time. It occurred to her, as the seconds ticked away, that such a watch would now be very useful.

Adric finished his "entering" and the beads magically adjusted themselves for the final puzzle. Nyssa had an instant to look at it, and then she was back on the TARDIS, where she saw the other half of the puzzle and a very distraught Doctor.

"Less than thirty seconds left."

"Doctor, this is the final puzzle."

"How would you know that?"

"Doctor, concentrate. Seven minutes and twenty-seven seconds ago two missiles were fired at each other. One flies at 21,000 kilometers an hour. The other flies at nine thousand kilometers. They are now exactly 1,374 kilometers from each other. How far apart will they be a minute before they collide?"

"Wait, how long ago were they fired? How far apart are they now?"

"Doctor…"

"I need some paper. Where did I put my notebook?"

"Doctor, it's 500 kilometers."

The Doctor stared, and then smiled. He quickly typed in the answer, with six seconds to spare. "Of course: 21 thousand and nine thousand kilometers equal 30 thousand kilometers an hour or 500 a minute." A number of buttons on the console made a series of almost charming noises. Everything indicated that both the TARDIS and the Concorde had escaped from the Celestial Toymaker's Mobius trap.

And then the Toymaker himself appeared. But he did not appear disconcerted that the Doctor had solved his puzzles. On the contrary he smiled with a sure, subtle expression of triumph. "Oh Doctor, you disappoint me. The point of the game wasn't the rescue of the Concorde. Of course you could do that. The point was to save Adric. You will not fully remember what happened this day. But you will remember this. The first time you met me, you won. The second time you did so, you lost. The third time we meet, you will lose everything."

Nyssa realized with horror that by breaking the Mobius strip she was losing her only connection left to Adric. With a singular desperate effort she made a last effort to will herself back to the Garden. With only a few seconds before they were lost forever, she gave an astonished Adric a deep kiss.

"Why are you crying?" Tegan wondered.

"I don't know," Nyssa replied. Through her tears she realized that all three them were on top of Heathrow 3 with the TARDIS just behind them, and watching the Concorde make a perfect landing.

"Well that's that," said the Doctor. "I'm going to use the TARDIS and check and see that the induction loop went away entirely. I'll be back in a few minutes." He quickly left.

Tegan started to leave. "I better go say goodbye to Madhabi and June. Want to come with me?"

"I will stay here, thank you."

"Suit yourself."

Soon Sheard was debriefing the Alpha Charlie crew. Not happily. "The airline, not to mention Whitehall, is going to need a full explanation."

"We did rescue the passengers and crew." Stapley pointed out.

"And got our own plane back from a time warp." Scobie added.

"Time warp indeed." Sheard objected.

"The Doctor was absolutely right. We've been away for a hundred and forty million years." Stapley averred.

"What about the overtime?" Scobie wondered.

Sheard was not amused. "You were only missing for twenty-four hours. And what about Victor Foxtrot?"

"Oh, Victor Foxtrot was never really lost." Bilton reminded everyone.

"What?"

"Should be on the other side of the sewage farm." Scobie realized.

"Must have been there for a hundred and forty million years." Bilton noted.

"You just have to dig it up." Stapley confirmed.

Just then the telephone rang and Sheard picked it up. "Yes? Oh, not that police box again."

Meanwhile, Tegan was chatting with Madhabi and June. "It's really good that we had this chance to meet again."

"Yes, the two of you are actually not trying to strangle each other," Madhabi pointed out. "It's a small miracle."

Tegan turned to look at an arrivals board. As she did so she began to stare into the distance.

"Hey! Space Cadet! We're over here!" June yelled.

"Sorry. It was just this was my job, being a stewardess, and now that I was with the Doctor, it just seems so… so… so…"

"Like an example of basically meaningless underpaid labour, that's massively sexist to boot?"

"I mean I always complained the Doctor didn't get me back to Heathrow, but now that I'm here, I'm realizing I would be nuts to be anywhere else."

"Well, you don't want to miss him, don't you?" The two hugged and Tegan went back to the top of Heathrow 3. As they watched her disappear, Madhabi spoke. "It may be the whole time travel thing, but I have this strange feeling. Although nothing the two of you do together will match what the best of what Tegan does with Nyssa and the Doctor, the two of you are destined to be the best of friends."

June laughed at the idea. And then she winced. "Good God, what a horrible thought."

As it happened, Heathrow Security were on the rooftop of Heathrow 3 and badgering the Doctor and Nyssa. "Ah, well, really, Officer, we're, we're just in transit, as it were." Sheard and the Alpha Charlie crew joined them on the rooftop. "Oh! Captain Stapley, I trust you had a good flight?"

"You're amazing, Doctor."

"Yes, well everyone, you all know my friend the Airport Controller. I'm sure he can give you a full explanation."

Sheard was not only not happy, but was quite ungrateful considering the circumstances. "I think I'm entitled to a few explanations."

"Er, well, I'll just make a quick phone call, which should clear the whole thing up." The Doctor and Nyssa quickly entered the TARDIS.

"You see, that police box is really a spaceship in disguise." Stapley clarified.

"And it's called the TARDIS." Bilton added.

"And it travels in time as well." Scobie concluded.

Sheard frowned. "Gentlemen, if you persist with this flippancy, it will be time to talk about..." But then the Tardis dematerialized.

Stapley and the rest of the crew waved goodbye. "Happy landings, Doctor." Just then Tegan came running up to join them. "Hello. I thought you were going with the Doctor."

"So did I."