An adventurer from beyond the stars crashes in Phineas and Ferb's backyard. Soon they're on a mission to rescue Meap and his planet. Big Mitch has his own tragic backstory and master plan to steal back his balloon best friend - at whatever the cost. But the Doctor struggles to earn Perry's trust, and even Phineas has his doubts. Is this lunatic really the hero he thinks he is?

Ferb is the child of River Song and the Doctor, being raised on Earth

The Doctor lands somewhere on Earth in the early twenty first century, where he instantly meets two boys. Hoping to impress, and rekindle their imaginations, he tells them he's been to space. What a surprise when he finds out they've been there too— multiple times, in fact! Shockingly enough, he finds out there's little he's done, that they haven't done also. Current Doctor: 11

The Doctor takes a job as a tutor in order to investigate some "space lasers", but soon finds himself with three new companions! Current Doctor: Ten; Current Companion: Rose. Will be definite mentions of Tenpetals, Amy/Rory and Eleven/River. Maybe slight mentions of Phinabella and Canderemy.

Dr. Doofenshmirtz summons a very strange minion.

On an ordinary trip to Paris, the Doctor and Clara end up crashing in Danville. The TARDIS has lost power due to a certain someone's -inator and, while it seems like a straight forward mission to get it back, a far more sinister force is watching and waiting.

"You could come with me, if you'd like; there's all of time and space to see." -— isabellecentric, phineasisabelle drabble

A normal day in Danville . . . That is, until Ferb hears something strangely familiar and has to call up an old friend for help.

One night, a strange shape crash-lands in Danville. It, and the being within, will flip Isabella's life upside down. If i said any more, i'd give the game away.

The Doctor has a promise to keep with a young Time Lord named Phineas Flynn. Read to find out more. For the Doctor, after the Time war, but before "Rose". For Phineas, summer after "The Doctor, the Widow, and the Wardrobe" aired, before series 7.

The Doctor and Rose take a side-trip to an intergalactic milkshake bar, and upon arrival, they discover that the place has changed ownership since the last time the Doctor had visited. "Hey, aren't they a little young to own a milkshake bar in deep space?"

During The Year That Never Was, two girls were on a mission to save the world from an evil Timelord. A one-shot fanfic gift from ttobba95 to me. :D

Alt ending ATSD. As Ferb fell he was saved, by a blue box? discontinued.

The Doctor gets a distress signal, a distress signal from a tiny American town called Danville. He expects adventure. Instead, he finds two children who are supposed to be dead, and sets off a deadly, erratic, and painfully fragile reaction.

Above the Earth, onboard the Gamestation, Hell was invading... My second present for you, Stinkfly3!

On the planet New Earth, hilarity ensues when The Last Human takes over the body of a time-lord Phineas. My gift to you Stinkfly3!

Phineas and Ferb are The Doctor's sons who can't stand each other. But what happens when they meet two girls from the 21st century who join them on their adventures in the TARDIS? AU Fanfic

"At last! My Time-And-Relative-Dimensions-In-Space-INATOR is finished!" Probably the only Doctor Who/P&F crossover ever; it's just a oneshot- and totally innocent. Read and review!