Ryan suddenly felt like he was in some sort of dream, the kind where you wanted to run but couldn't force your legs to move.

"Ryan!" a familiar, angelic voice floated towards him.

He turned and saw Grace standing in an exhibit, holding her arms out to him.

"Gran," he said, starting towards her.

Someone grabbed his arm, and he tried to pull away.

"She's not real, Ryan," Graham's voice said. He sounded distant, as if he were underwater. "She's dead."

"I am real," Grace insisted softly, still in a sing-song voice. "Come here, Ryan. I've missed you."

Graham stood in front of him, blocking his vision. "Stop it. Look at me. You're seeing things. She's not there."

"She is, though!" Ryan said firmly, pushing him out of the way. "Let me go!"

Graham tightened his grip on Ryan's arms. "It's a trap, Ryan, you have to listen to me."

"Jack, mate!" Mickey Smith said, waving. "Where have you been hiding?"

"Been a long time," the ninth Doctor said, grinning.

"What are you standing around for?" Rose teased. "Get over here."

Jack blinked and stared at them. "Rose?" he asked. "But you're in the other universe..."

"I found a way back," she said, smiling.

"But you regenerated," he said, pointing at the Doctor. "This...this doesn't make any sense."

"That's Time Travel for you," the Doctor said, shrugging. "Why don't you join us? We're about to have a cuppa tea."

Jack felt himself being inexplicably drawn towards them, though he knew it was wrong.

The Doctor shook her head, trying to clear the fog that had invaded her brain.

"Stay alert," she said, trying to warn her companions.

"Doctor! Doctor!" several voices screamed.

Despite her misgivings, the Doctor turned and looked inside one of the exhibits. There, trapped behind some sort of chained net, were her old companions. Amy, Nyssa, Bill, Adric, Martha, Polly, Sarah Jane, Jo, Clara, Jamie, Rory, Leela and Romana.

"Doctor, help us!" Clara pleaded, tugging on the chains.

"You're not here," the Doctor insisted, turning away.

"Doctor, please!" Martha cried. "They captured us so you would open the TARDIS. Please, you have to help us!"

The Doctor forced herself to look away. She could see Graham struggling with Ryan, and Jack and Yaz each being drawn towards an exhibit.

"It's a trap," she realized.

"Doctor...Is that you?"

Her eyes were drawn to another exhibit, this time with only one inhabitant.

"Rose..." she whispered.

Rose smiled. "Hello, Doctor. Aren't you pretty."

"You can't be here," the Doctor insisted. "No, you're not here. You're in another dimension."

"I came back for you."

"That's right, you did," the Doctor said. "But then you went back. You went back with the human Metacrisis of me. You're safe there, you're happy with him. You have a family."

"He's not you."

"Go away, Rose," the Doctor said, trying to look away. Deep down, she knew it wasn't real, but she desperately wanted it to be.

"Hello, Sweetie," River said sweetly from another exhibit.

"Oh, not you too!" the Doctor cried. She couldn't shake the vision from her mind. The harder I fight, the stronger it becomes...Oh! It's telepathic gas!

"You left me for her?" Rose asked, looking hurt.

"Oh, don't make me feel guilty," the Doctor said. "You're just a figment of my own imagination."

She squeezed her eyes shut, trying to block out the images, but that just made her incredibly sleepy. Her eyes opened, but they were still there, beckoning her to join them.

"Dad!" Jenny cried.

Rose and River disappeared and in that moment, all the Doctor could see was Jenny, racing towards an exhibit. She leapt into action, jumping in front of her daughter at the last second.

"Let me go!" Jenny cried, struggling against her.

"He's not there, Jenny," the Doctor said. "It's just an illusion. There's a telepathic gas making us see whatever we want to see. It's a trap, it's trying to pull you back into the exhibit."

"I don't care," Jenny growled. "I don't care, he's in there and he needs my help."

"That's not the Doctor, I promise!" the Doctor yelled, growing more and more frantic the harder Jenny fought her.

"How do you know?" Jenny snapped. She backed away from the Doctor and took a fighting stance.

Of course. She's a soldier, the Doctor realized.

"I've spent twenty years searching for my father, and you're not going to stop me now."

Jenny lunged to the side, but the Doctor was faster. She wrapped her arms around Jenny tightly, refusing to let go. Jenny was real. She had to be real. The Doctor realized she had no other choice.

"Jenny, stop!" she yelled. "The Doctor isn't in there because I AM the Doctor! I'm your father!"

Jenny tore out of her arms and stepped back, looking at her in shock. Out of the corner of her eye, the Doctor saw that Jack had also stopped and turned to stare.

"Jack, stop Yaz!" she yelled at him.

"You're lying!" Jenny said. "You're just saying that to stop me!"

"No, I'm not," the Doctor said, grabbing onto her arms to make sure she didn't try to run again. "The Pandlorians didn't make a mistake, I am the real Doctor. I've just regenerated."

"I don't believe you."

"You are my daughter," the Doctor insisted, tears running down her face. "I wasn't even the one who named you. Donna named you Jenny because I called you a generated anomaly. I was cold and distant toward you because I didn't think you were real, and I didn't want to get attached to you. But you were incredible. You cartwheeled through a laser maze like it was nothing. You chose to join me instead of the violence of the Messaline humans. We found the Source together. You died in my arms after saving me from General Cobb. I waited so long, waiting for you to regenerate. I promised never to leave you behind, you were going to travel with me. I was so excited to have a family again...You are my daughter and I love you. I'm not letting you go again."

Overcome with emotion, the Doctor embraced Jenny again, fighting back sobs. Slowly, Jenny hugged her back.

"Doctor!" Jack called. "I found the tunnels, come on!"

The Doctor grabbed Jenny's hand and pulled her towards Jack, keeping her mind fixed on getting Jenny to safety so that the visions of her other companions didn't disrupt her again. Jack stood by the entrance, where he had already saved a shaken Yaz. The Doctor kept her hands on Jenny until she had descended into the tunnel, then turned to find Ryan and Graham. It took all three of them to force Ryan down. The Doctor breathed a sigh of relief, knowing that they were all safe.

But that was the wrong move.

"Oi, you!" a voice called behind her.

Without thinking, the Doctor turned, and her breath caught in her throat. It was Donna. She stood in the middle of the street, looking around in confusion.

"Where am I? What's happened? Who are you? Can you help me?"

"Oh, Donna," the Doctor sighed.

Suddenly Donna clutched at her head in pain. "You're the Doctor!" she screamed. "No! Help me! My head!"

The Doctor lunged forward. It was too real. It had to be real. The Pandlorians must have captured her from earth and brought her here. Jack and Jenny caught her arms and pulled her back.

"It's not real, Doctor!" Jack yelled. "Snap out of it!"

"They've got Donna, Jack!" she insisted. "She's not a vision, it's actually her. Her brain is burning, I've got to help her!"

"Donna Noble is dead," Jack said firmly. "She died of old age without ever remembering who you were. I was at the funeral, I know."

The Doctor froze, looking up at him in shock. Jack and Jenny pulled her into the tunnel and closed the door. A loud rush of wind flooded through the tunnels, dispersing the gas so they could all breathe again. The Doctor's legs gave way and she collapsed on the ground, two hearts pounding. Graham was comforting Ryan beside her.

"Why couldn't you see her?" Ryan cried.

"I did see her," Graham said gently. "But I've seen her a lot, so I knew it wasn't real."

The Doctor drew in a shaky breath and rubbed her temples.

"I'm sorry, Doctor," Jack said, sitting across from her. "Donna died years ago. There's no way they could have brought her here."

"I know," she whispered.

"Is this the same Donna that named me?" Jenny asked.

The Doctor nodded. "Long story for another day."

"Everyone take a few minutes to breathe," Jack said calmly.

"Yaz," the Doctor said, noticing she was sitting off to the side.

"Hmm?" Yaz started and looked up at her blankly.

"Are you alright?"

"Yeah," Yaz nodded.

"What did you see?"

"I'd rather not talk about it, actually," she said.

The Doctor nodded understandingly. She was sure they were all emotionally drained.

"Why didn't you tell me the truth?" Jenny asked quietly.

The Doctor sighed. "I didn't know if you were real...or a trap. I'm sorry. Do you believe me?"

"Maybe," Jenny shrugged.

"Hang on," Graham interrupted. "Did I miss something?"

"Right, sorry," the Doctor said. "You can call me Doctor again now. Jenny is my daughter."

"You didn't tell us you had a daughter," Graham said.

"Well, I didn't know she was alive until a few hours ago," she explained.

"What regeneration are you on now?" Jack asked.

"Thirteen."

"Wow. And a woman."

"Yep."

"Time Lords can do that?" Jenny asked.

"We can kill and regrow every cell in our body. Of course we can. I've regenerated three...well, four times actually since we last met."

"Still the same old Doctor," Jack teased.

"How soon did you pick up on that?"

"On the ride over," Jack smirked. "I've been around long enough and have met enough of your regenerations that I have a knack for picking you out now."

The Doctor smiled. "I'm not that predictable, am I?"

"Keep telling yourself that."

Grinning, the Doctor got to her feet. "Right. Come on, gang, let's go find the TARDIS."