Ace opened her eyes. She was in a small circular room about 12 feet in diameter, made entirely of stone. The only door was made of iron, with a small window that let candlelight creep through.

'Where am I? What was I doing?' she sat up and racked her brain. 'I... I was with the Doctor... He disappeared! I need to find him!' She stood up and banged on the door. "Hello? Is anyone there?"

She heard a key turn in a lock down the hall, then overhead a robotic voice say, "You are Rory Williams, companion to the Eleventh incarnation of the Doctor. You will follow me."

A few moments later, she saw a tall silver robot pass, followed by an English man with short brown hair and a red shirt. They looked at each other as he passed, his eyes filled with fright, and he disappeared out of her sight.

Two minutes later, the robot returned and opened her door. "You are Ace, companion of the Seventh incarnation of the Doctor. You will -"

It was interrupted by Ace, who tried to punch the robot. A small hatch on its forehead quickly opened and an energy beam shot out, stopping Ace's arm mid-swing. The beam extended around her, wrenching all control away from her. It dragged her out of the room, and they started down the hall. She passed another cell and saw Seven inside.

"Doctor!" Ace shouted.

Seven looked up. "Ace?" He got up. "What's going on?"

Ace was shocked. "You don't know?!"

He shook his head. They looked at each other, fear filling Seven's eyes.

Ace was then brought out into a large arena with a glass dome high above her. The sandy floor was littered with sticks, several pillars stood in a circle in the center, and there was a large iron door opposite to her. Outside of the arena were bleachers filled with hundreds of familiar species.

The robot took her to one of the pillars, where she was tied up. She tried struggling, but the ropes got tighter.

"Don't bother," a Scottish voice said. Ace looked up and realized that there were other people tied to the other pillars (save for one, which Ace reasoned would be where Seven was going to be tied up). There was the man she saw pass her cell (Rory), a man with a long brown coat (Ten), a man who was dressed as though he was born in the 1800's (Eight), a man in a tweed jacket and bowtie (Eleven), a woman with fiery red hair (Amy), a man with blonde hair (Sam), another man in his nightgown (Jack), and a woman with short brown hair that nobody there had ever seen before.

"These chains tense up the more you try and resist," Ten continued.

Ace heard struggling behind her, and turned her head to see Seven being tied up.

"Doctor!" she exclaimed, "I'm so glad you're alright! What do you make of this?"

Seven looked around. "It seems we're in an arena of some sort. I'm assuming that we're about to be put through some great ordeal that needs lots of space, but I have no idea what that would be."

Amy turned to Ace. "That's not the Doctor! The Doctor's over there!" She tilted her head towards Eleven.

Seven said to her, "I think you may be confused; I'm the Doctor."

Eight, Ten, and Eleven turned towards Seven. "We're the Doctor!" they all said in sync.

Ace asked, "So wait, you're all the Doctor?"

Seven exclaimed, "Preposterous! I've never been any of them before in all my lives!"

Eleven said, "That's because we're your future incarnations."

Seven was aghast. "I can't believe it..."

Ten said, "Well, that's reincarnation for y-"

"I can't believe how bad I look in the future!"

"Me!?" Ten asked, aghast.

"No, you're fine. I'm talking about Mr. Bowtie over there."

Eleven was offended. "Well, excuse me, Mr. 'Question Marks on Everything'! I've got more fashion in my right hand than any of you had in your entire wardrobe!"

Amy shook her head as they went back and forth arguing. "Sometimes, I could swear I'm the most mature person in the TARDIS."

Ace asked her, "You travel with him?"

"Yep, me and my husband Rory," she gestured to Rory, "both do. I'm Amy, by the way."

"I'm Ace. It's a pleasure to meet you."

Ace wanted to shake her hand, but they were too far apart.

Suddenly, the audience erupted in a roar of cheering. Ace saw that they were cheering because a robed figure had entered the arena on a floating platform.

Eleven and Seven stopped arguing. "What's going on?" Eleven asked, looking up.

The robed man took out a futuristic microphone and began speaking in a very deep voice.

"Creatures of all species! I know the wait has been unbearable, but we're finally ready to start! Over 900 years in the making, I'm proud to introduce 'The Battle of the Doctors'!"

The crowd roared louder.

"Say what now?" Sam asked.

"The rules are simple: The contenders must survive five rounds of two minutes with some of their most deadly adversaries. They're allowed to use whatever they had on them when they were taken, as well as anything they find in the arena. If a Doctor is eliminated, their companions are also eliminated. All eliminated contenders will be transferred back to their time, along with an entire army of Daleks! But everyone who survives will receive a time-wish, completely Paradox-free (restrictions apply, results may vary)! After everything has concluded, the contestants' memories will be altered to remove any traces this experience."

The Doctors looked at each other with scepticism.

"So, without any further ado, let the battle commence!"

The robed figure waved his arm, and all the ropes came undone.

Ace shouted at the figure, "Hey! Why are you doing this!?", but he didn't hear. Instead, he lifted his hand, slowly opening the iron door.

The brown haired woman said, "So why am I here? I don't know any of you!"

Ten looked her over. "You do seem kinda familiar... Bowtie, do you know who she is?"

Eleven said, "I've been alive for 910 years, and have gone all across space-time; there's a great probability that I met you at some point. Off the top of my head, though, I can't say I remember you." Eleven turned to the robed figure. "Hey! Before we start, might I ask: why's this girl here?"

The figure looked at her. "My sensors indicated that she has ties to every incarnation of the Doctor, the strongest ones with your incarnation."

Eleven was surprised. "That's odd, because I don't remember her in the slightest."

"My sensors do not lie; you have met her many times before."

Eleven looked at the woman. "What's your name?"

"It's 'O'."

"And you're sure you've never met me before?"

"As sure as the sky is blue," she looked up at the red sky, "at least, it is on Earth."