A/N: I got the idea from a picture on DeviantArt that showed the cast of Phineas and Ferb in the world of Doctor Who. However, the only thing I didn't like was having Phineas as Rory and Candace as Amy. Everyone knows Amy and Rory are a married couple at this point and Phineas and Candace are ONLY siblings.

Here's the casting list for my fanfic. I tweaked it so it would be appropriate enough for my favorite moments from Doctor Who

Ferb=Matt Smith's Doctor (from the picture)
Candace=Amy Pond (from the picture)
Phineas=David Tennant's Doctor (my favorite Doctor)
Perry=K9 (from the picture)
Isabella=Rose Tyler (I support The Doctor's relationship with Rose)
Vanessa=River Song (similar personalities)
Doofenshmirtz=Davros (from the picture)
Norm=Daleks (voice only as a comic relief)

Enjoy!

"Oh for crying out loud! Do you REALLY have to eat that in front of me?"

"Well, it's not my fault the TARDIS rearranged the rooms again. Besides, what I'm eating is much better than your taste in meals."

"But I like bananas. Bananas are good."

"And fishsticks dipped in custard isn't?"

"No, that's just gross."

This was a typical morning for brothers Phineas and Ferb, The Doctor's sons. Ever since their father died after using all of his regenerations, they were told to travel in his TARDIS to different worlds and times. However, they couldn't stand each other.

Phineas was funny and adventurous. He liked bananas (but not pears), knew French, and had a habit of rambling when he talked. He also wore pinstripe suits and converse sneakers, while occasionally wearing his father's brown coat.

Ferb, however, was more of a serious person. He thought bowties and fezs were 'cool', wasn't afraid to kill someone, and would sacrifice himself in order to save someone's life. He also took the more logical approach instead of the obvious method.

In other words, neither Phineas nor Ferb inherited traits from the same Doctor.

"Sometimes I question why father wanted us to travel together," Ferb said. "Because you really do get on my nerves."

"No kidding," Phineas responded. "Why did you have to inherit traits from dad's eleventh life?"

"You should be thankful I'm not like father's ninth life," Ferb pointed out.

"Actually, you wouldn't look bad in lether jacket," Phineas said. "It would be an improvement from those rediculous things you always wear."

"Bowties and fezs are cool," Ferb insisted. "Your style, however, is a combination of two things that shouldn't go well together."

Before Phineas to respond, a 'Gyururururururu' interrupted him. That was none other than Perry, an alien platypus the two brothers met on their first adventure. Perry was wearing a brown fedora, a grey body suit with his initials on the side, and a long multicolor scarf. He was looking at the two like he was saying 'Do you two always argue like this?'.

"Ferb was eating his 'breakfast' in here," Phineas told Perry.

"Again, the TARDIS rearranged the rooms on me," Ferb said.

"Gyururururururu," Perry said, pointing to the control counsel, trying to tell Phineas and Ferb that the TARDIS just landed.

Phineas walked over to a monitor. "Where are we?" Ferb asked.

"Danville, South Dakota in the early 21st century," Phineas reported. "Maybe we'll find a companion here."

"Or maybe you'll let Vanessa Song come with us this time if she's here," Ferb said.

"For the last time, I'm not letting her come here," Phineas argued. "She's too dangerous to be trusted."

Ferb rolled his eyes as he, Phineas, and Perry stepped out of the TARDIS.