A/N: DOCTOR WHO IS BACK! WOHOO! This takes place between "The Doctor Dances" and "Boom Town," for those who would like a general timeline. Apart from that, hope you enjoy and please review!

Disclaimer: Neither "The Dark Knight Trilogy" and "Doctor Who," and the link to the place I got the cover art from is on my profile.

The Doctor Begins

"So where are we Doctor?" Rose asked, stepping out of the TARDIS into the puddle filled streets of a towering city. The leather jacket clad Ninth Doctor licked his finger and held it to the air as he sniffed his surroundings.

"A little more than a year in your future … North America… probably North Eastern Unites States… Gotham City."

"We're in Gotham?" Jack Harkness asked, sticking his head out of the TARDIS.

"What's Gotham?" Rose queried.

"Gotham City, home of the Batman, Catwoman, the Joker, it's a city of insanity and adventure," Jack explained, grinning. He'd read about Batman as a kid and had always like the sound of him.

"I've always avoided cities like Gotham, a lot of history, too risky to visit," the Doctor frowned, stroking the TARDIS doors and checking his watch. "Speaking of which, I think we should go."

"What?" Rose and Jack cried.

"If I'm right, which I usually am, then tonight is the first night the Batman saves Gotham." Clanging echoed behind him and the trio turned to see a raised train drive by on the track, steam erupting from below and sending manhole covers skyrocketing, a black clad figure swinging from beneath the train. "And there he goes."

"A man… dressed like a bat… who saves cities… from what exactly?" Rose inquired.

"Oh y'know, the Mob, terrorists, chemical warfare, and bombs."

"He sounds like a more normal version of you," Rose smiled. The corner of the Doctor's mouth twitched up and he headed back inside, emerging moments later with three gas masks.

"Put these on. Don't want either of you getting poisoned," he said, handing a mask to each.

"Are you my mummy?" Jack teased after putting his on.

"Oh don't start that again." Rose frowned when she saw people outside, choking and running away from the gas.

"Wait… Doctor."

"No Rose," he said shortly.

"Doctor, if there are people dying out there–"

"Rose, we went over this, we can't stop fixed points."

"But the fixed part's already happened! Can't we help the people who have already been poisoned? Or is that against the 'oh so important Time Lord rules?'" Rose spat. The Doctor closed his eyes and pinched the bridge of his nose, making Rose's glare soften. "Doctor… can't we at least make sure this is an entirely human occurrence before we leave?"

"Rose…" he faltered at her pleading look and felt his resolve crumble and cave. "Alright. I'll analyze the gas, nothing more!"

"Thank you."

"I'll go get a sample of it," Jack volunteered through his gasmask. He headed out into the fog and returned with a vial of the white poison. The Doctor plugged the vial into the TARDIS console and smiled when the result popped up.

"Well, what'dya know. The flowers are of alien origin."

"What?" Rose asked, staring at the screen.

"Yeah, you know how in the Columbian exchange plants from the New and Old Worlds ended up on the other side of the ocean because people took them or accidentally carried them in their cargo? Same principle, only with spaceships and interstellar travel."

"Meaning–" she smiled.

"I can help."

"Yes! Thank you!" she shouted, leaping into his arms and pecking him on the cheek. He set her down with a smile and got to work on a device to rid Gotham of the gas.

"Aw come on, how come I don't get any of that?" Jack complained and Rose rolled her eyes and kissed him on the cheek too.

"Better?"

"Well…" Rose slapped his arm and they both chuckled as the Doctor fiddled with a device. He then hauled it outside with the gas-masked companions' help.

"Stand back," he ordered, pressing the trigger. A blast of fire skyrocketed into the atmosphere, where it exploded, drawing all of the poison gas away from the city and burning it as it spread in a blanketing inferno.

"What was that?" Rose asked.

"An atmospheric converter. I set it to ignite a certain kind of gas and send the blast into the sky and it burns all the gas of that type over a certain radius. This one was just large enough to burn all the poison gas in Gotham. The people will have to be cured of the effects individually but at least no one else will be infected."

"That could come in handy sometime," Jack stated, examining the device.

"Maybe. Anyway, better head out before the police arrive. The GCPD isn't exactly the friendliest of forces," the Doctor said and his two companions filed back into the TARDIS and vanished with a VWOOP VWOOP.

A/N: Not the best, I know, but it gets better, I promise.