A/N: Okay, this is a very random idea that just came to me one day, probably with the help of coffee and sugar :) For logical reasons, it probably should be the ninth Doctor, but as I like ten better I'm using him. I've posted this in the Doctor Who section because I thought it was more likely that I'd find Who fans that liked Pirates than Pirates fans that liked Who, if you get what I mean. Please R&R, ta!

Disclaimer: I don't own Doctor Who, Pirates of the Caribbean or any of the characters from them, which is probably a good thing, because I'd be torn between the Doctor and Jack Sparrow, lol. I'm not making money from this. If sued I have nothing to offer but a jar of pennies, not a single doubloon, sorry.

Summary: What happens when a rift in time causes Jack Harkness to switch places with Jack Sparrow? Minor chaos, of course :) Pairings are leaning towards Rose/Ten and Sparrow/Elizabeth.

Prologue.

Barcelona. One of the galaxy's most beautiful, interesting and unusual planets. The TARDIS was leisurely flying towards it, for once spinning through time and space with little instability.

Tucked away in the closest thing the control room could offer for a corner, the Doctor was busy conducting a delicate operation. Rose Tyler and Captain Jack Harkness sat nearby, watching silently as the Doctor frowned and leaned over the table to study the object on it. Tongue poking out in concentration he let a single drop of liquid from the decanter in his hand drop into the container below. "Steady," he muttered.

Jack and Rose leaned forward.

"Can't…let it…become…too," (another drop), "…weak."

"Or what, Doctor?" Rose asked, craning her head to try and see what he was doing.

The Doctor's eyes never left his task as he replied, tipping another couple of drops. "Or…it'll…"

"What?" Rose enquired impatiently. "Explode? Catch fire?"

"No," the Doctor said. "It'll…taste appalling." With a beaming smile he turned to his companions and placed the milk jug back on the table. Holding up his cup of tea he took a sip and said triumphantly, "Almost perfect!"

Rose and Jack looked on, incredulous as he picked up the jug again.

"Does he do this often?" Jack whispered.

Rose leaned in to reply. "No. But since his regeneration he's taken a fancy to strong tea."

"I didn't notice that the old Doc did it. This is weird."

"I thought you knew about this regeneration business," Rose said.

"Yeah, but that doesn't mean it's not weird when it happens to someone you know."

"Just…one…more…drop," the Doctor declared. Sudden turbulence caused them all to lurch forward. A large amount of milk slopped into the cup, causing him to swear in an uncharacteristically violent manner. It had been in Gallifreyan, but conveniently, (or perhaps not), the TARDIS had translated it.

Jack, who was nearest, leapt to his feet and hurried to study the monitor. The Doctor followed, shaking lukewarm tea off his hands. Rose also hurried over, making sure to hold on to the console or risk falling inelegantly on her backside. She watched the Doctor's expression as he glanced over the controls. Her curiosity did not stay quiet for long. "What is it, Doctor?" she called.

"A disturbance in time. A rift. Come and look!" He held out a hand, grinning with his usual boundless enthusiasm, pulling her over to look at the screen.

The rift looked almost exactly like one of the CGI nebulas on Star Trek. It was a mass of smoke and lightning, hazy white in colour. "That's a time rift?"

"Certainly is."

"Guys," Jack called, studying the nav computer, "we're heading straight for it."

The Doctor moved round to look at the controls, pressing a button here and pulling a lever there. He frowned. "The TARDIS is locked on course. There's nothing I can do about it. It's stubborn sometimes."

Rose raised an eyebrow. It had not taken her long to realise the extent of the TARDIS's stubborn nature. Sometimes the Doctor and the ship would have childish arguments, usually resulting in mutual sulking and reluctant making up. Roseheld on as the ship flung them all about. On the monitor the rift had turned a brighter shade of white, the brightest white she had ever seen.

Jack's frown deepened as he glanced at the nav computer. "What the hell?"

Then the white light engulfed the TARDIS completely, causing them all to squint. When it faded the Doctor and Rose opened their eyes and gasped.

Jack was gone.

Somewhere on the ocean, not far from the unlawful town of Tortuga, the noble ship The Black Pearl was making its steady way out to sea. At the helm, Captain Jack Sparrow stood grinning, watching one of the most amusing fencing matches he had ever seen take place. Of course, fencing always became more amusing when one of the opponents was a shapely young woman. Elizabeth Swann was holding up well against her unlikely beloved, Will Turner. Jack's swordbearing lessons had clearly been paying off for her.

Jack smirked as Lizzy lightly hit Will's knuckles with her blade, drawing a yelp. Will really could act the pansy sometimes. Lizzy would be much better off with a proper pirate. Him, for example. He amused himself by imagining various different ways to woo her away from Will. All seemed ingeniously successful in his eyes and he wondered how best to go about executing them. His reflections were interrupted by the woman herself as she joined him. He blinked and searched the deck. "Where's dear William?"

"Gone below to bandage his hand."

"I didn't think you'd hit him that hard."

"I didn't," she said with amusement in her eyes.

Jack smiled. Elizabeth noted it and hid her own smirk. "Was I doing alright?" she asked.

"Bloody marvellous, luv," he praised. "You look a true pirate in those clothes, even if they do hide your...charms."

Elizabeth swiped at his arm, glancing down at her borrowed attire. "You've used that line before, it won't work any better now than it did the first time. Besides, you should be careful," she said, faintly blushing, "you wouldn't want to suffer the jealous wrath of Will."

"Oh, heaven forbid," Jack exclaimed in mock horror.

"Captain!" came a cry from the deck. "There be a fierce fog up ahead." The speaker was Gibbs, the closest thing to a voice of reason in the crew.

Jack and Elizabeth stared at the mysterious and apparently completely random fog that the bow of the ship was now entering.

"How odd," Elizabeth muttered.

"Yes," Jack agreed. "Obscure, even compared to what we've seen, eh, Lizzy?" He was the only soul on board that dared to address her by this nickname. Not even Will managed it. She didn't even bother to correct him any more.

In a matter of seconds the whole ship was completely enveloped in the smog. Nobody could see more than a foot in any direction. "Nobody move!" Jack hollered. "I don't want anyone slacking off work because they tripped over a bucket in the dark!"

"Elizabeth!" Will's voice yelled.

"That goes for you too, Turner!" Jack announced.

"But where's–"

"I'm fine, Will!"

Just to reassure the whelp's peace of mind, Jack added, "She's with me." And if ensuring that Lizzy didn't get lost meant that he had to put an arm around her waist, so be it. She didn't object. In fact Jack suspected that she hadn't even noticed. The strange fog was unnerving them all. In the middle of it a white light was steadily developing.

"Can't you steer us out of it, Jack?" Elizabeth asked.

"Tried, luv, the helm's stuck." He pulled his unusual compass from his belt and peered at it. "What the hell?"

The white light grew stronger, causing them all to hide their eyes. When it passed it took the fog with it. Elizabeth gasped.

Jack was gone.

A/N: Next update will hopefully be fairly soon. What did you think?