The console room lurched violent, almost tipping ninety degrees to the side, the Doctor holding onto the console, the old man hanging on for his life. Suddenly the ship righted itself, the Doctor landing on the floor with a thud.
"Now what's all this then?" he said crossly.
"Doctor," said an unusual voice. He looked up to see a strange woman standing in front of him.
"What have you done with my ship, hmm?" he said angrily. "And where's my grandchildren?"
"I don't know," said the woman. "But I recognize you. We met, on Gallifrey."
"I have no idea what you're talking about, young lady," said the Doctor testily.
"I'm Sarah Jane Smith," said the woman. "I'm a companion of the Doctor's."
"Are you really?" said the Doctor. "Well then, you can kindly tell me what you are doing on board my ship. Where is your Doctor?"
"I don't know," admitted Sarah Jane. "One moment I was in the TARDIS, and now I'm... here. Perhaps we should go outside, have a look around?"
"Perhaps we should," said the Doctor. "But only after I've finished my scans." Without pausing Sarah Jane leapt forward, pressing the door controls and bouncing outside. The Doctor sighed in annoyance and went to follow her.
Then stopped. The cloister bell, it was ringing. Pounding away throughout the console room. The Doctor hurried back to the controls. For some reason something was in his TARDIS.
"Hello," said a strange voice, oddly familiar but unable to place it. "Doctor, are you there? Doctor?"
"Yes, I'm here," said the Doctor grouchily. "Who is this?"
"It's the Doctor," said the voice. "Well, the Doctor from the future, at any rate. Listen, you must leave right now. It's urgent. Dematerialize immediately."
"Not without my grandchildren," the Doctor said stubbornly.
"Oh of all the," said the voice, but it cut off.
"Come on Doctor," said Sarah Jane Smith eagerly.
"How did you get back into the TARDIS?" asked the Doctor. "I didn't see you enter again. And believe me young lady, I keep a close eye on who comes in and out of my TARDIS."
"But your grandchildren are out here," said Sarah Jane Smith.
"Don't listen to her Doctor!" said another voice. The Doctor turned to see another strange woman standing in the console room.
"And who are you?" he asked.
"Clara," said the woman. "But, well, kind of. The Doctor sent me. He told me to get you to leave right now, before it's too late."
"Nonsense," said Sarah Jane Smith. "Don't listen to her. You can trust me."
"No Doctor," said Clara. "It's a trick. She's trying to trap you here."
"Oh come now Doctor," said a male voice. The Doctor turned to see Ian and Barbara standing with Sarah Jane Smith. "You're not really going to believe that stranger, are you?"
"I rather think he should," said another man. The Doctor spun round yet again, seeing some sort of soldier next to Clara. A brigadier, judging by his uniform. "Doctor, you can trust me. I'm your oldest friend. We've been through so much."
"I don't know what's going on," said the Doctor, confused. "I don't know who any of you are. I just want to know what's going on."
"You're here to help us grandfather," said John, having suddenly appeared in the console room. "Gillian's outside, and she wants you to come help us to defeat the Kleptons and Trods. Surely you can believe your own grandchildren?"
"Don't listen to him!" said Clara. "Please, Doctor, you have to trust me."
The Doctor shrank back, terrified. Whatever was happening, whatever had invaded his ship, it was clearly trying to attack his mind. Already he could feel his mental defences go up.
"I know you're scared," said Clara. "But fear makes companions of us all."
The Doctor paused, turning to Clara. He hadn't told anyone that, and yet, the voice... it had sounded so familiar. He thought he heard it in a dream.
"Grandfather!" screamed Gillian. The Doctor spun around yet again, seeing Gillian at the door, struggling against the monsters holding onto her. The Trod held one arm, the Klepton the other, and slowly they were pulling her outside the TARDIS. "Please, Dr Who, come outside and help us."
The Doctor turned away from Clara and the brigadier, moving towards his grandchildren. They needed help, and he wasn't going to let those nasty monsters win. As he moved he didn't notice everyone disappearing, the TARDIS growing dimmer, as if it was being swallowed by the blackness. He was at the door, ready to step outside into whatever darkness awaited him.
"Grandfather," said a soft, quiet voice. The Doctor froze. He turned, slowly, facing his one and only grand-daughter.
"Susan," he said, before breaking down in tears. "Oh Susan, how could I forget about you my girl."
"Grandfather, it's okay," she said, hugging the old man. "It's okay. But we need to leave, now. If you trust me, if you love me... please, leave. Now."
"Of course," said the Doctor, starting the dematerialization sequence, the console room suddenly bursting with light. He let out a small smile as the familiar sound filled the room, the TARDIS disappearing.