"Shouldn't we be there by now?" Felix had only taken one other trip in the TARDIS, but it hadn't taken this long and that was from the 2010s to 1800s; he imagined it should take less time to go to the sixties. Once he thought this he realised he had no idea if it was true, and it occurred to him that he was putting his life in the hands of a science that he had no hope of comprehending.

The engine moaned and the Doctor studied a small screen on the console, "We're moving too slowly; there's some kind of interference in the vortex." He spun his favourite pin-wheel thoughtfully.

"What does that mean?" Felix asked, wondering how a time machine could have a relative speed.

"Something's trying to stop us." The Doctor's brow furrowed, he flicked a switch and then the TARDIS lurched so violently that both he and Felix was cast to opposite sides of the platform.

Felix slammed into a railing and all the air was knocked from his lungs, "Can't you counter it?" He wheezed.

"I don't know what 'it' is." The Doctor responded and the machine gave another shudder, with a sound like a tree falling.

Felix, clinging to the rail for dear life, asked "Has this happened before?"

"Oh yeah, loads of times: it's really very easy to remotely hijack a time machine."

Felix couldn't tell if he was being sarcastic or not. "How does one do that exactly?"

"I don't know- I'm always the one at the controls, being hijacked. I think it normally involves harmonics or something. But if you wanted to know the specifics, you'd have to ask-" He froze, and his eyes lit up with an idea, "Be right back." He tried to run off down the steps, but the ship pitched too violently and he found himself crawling on all fours.

Down in the brig, Missy sat perfectly perched, the TARDIS dipping and shaking around her, but her balance perfectly maintained. It was an old Time Lady trick. As per usual, she was reading and didn't seem to notice the calamity around her; however, when a spiky blue alien appeared in her cell, she might have paused for just a second.

"Can I help you?" She still hadn't actually put down her book.

"You're not Felix." Narrath looked confused.

"Am I not? Well, I'm sure we can change that."

"Where am I?" He looked about the Brig- the glass walls, the stark lighting- and felt dismayed. "This can't be the TARDIS."

"Oh, can't it? Good. I'd much prefer to be kept in a regular prison- they're so...breakable. Did you know I just walked out of Auschwitz. After hypnotising the guards and feeding them to sharks, of course, but it still took less than five minutes."

"A prison?" Narrath looked appalled.

"Yes, dear, welcome to Fort TARDIS, where the only thing to fear is the black and grainéd spots of your soul as you stare at them for eternity. Meals at quarter past the century."

Narrath shook his head, "The Doctor wouldn't do this."

"Tell him that, maybe he'll find some kindness in his heart and let me go." She fluttered her eyelashes and pouted theatrically but there was a glint in her eye that struck terror into Narrath's heart.

"Who are you?"

"Well, you're already said I'm not Felix. Is that who you're looking for?"

"I was looking for someone with revenge on their mind..." He tilted his head to one side as he looked at her.

"You've come to the wrong place. I'm not planning revenge- just stone cold cruelty. It's much better because this way I don't have to be wronged."

Narrath began to back away, fading as he did, "Yours isn't a mind I wish to know."

Missy called after him, "I'll keep an eye out for Felix! Tell him you're looking for him!"

A few seconds after he'd faded, the Doctor burst into the room, as the TARDIS rocked violently from side to side. "Missy-"

"I've had enough visitors for today, thank you." She trilled.

"Visitors? What visitors?"

She smiled at him, "Oh, you know me. I'm just being crazy, as per usual. Best to disregard it."

The Doctor considered for a second, but then the TARDIS rolled to the left and he banged against a wall, "Something's trying to stop us from reaching the sixties."

"I have absolutely no insight on the situation," Missy said coldly, picking up her book.

"But-"

"Good day. I trust you know the way out?"

The Doctor looked like he might respond, but instead he turned away, muttering under his breath. The door to the corridor slid open, he stepped through and fell into a bottomless chasm.