Moshi moshi! Sapphire Nightshade here! This is my second crossover, but my first crossover idea. I lost the original document that contained the very beginning, but as I wrote the new one, I remembered bits and pieces from it. However, I still changed it a bit from that beginning that only I knew.

Anyway, here's the first part of my story. Let me warn you, it starts out with the crossover theme song.

Special Episode - part 1:

There's 104 days of summer vacation,
And school comes along just to end it.
So the annual problem for our regeneration,
Is finding a good way to spend it.
Like maybe . . .

Meeting the Doctor or fighting the Daleks,
Or climbing up the Torchwood Tower.
Discovering something that shouldn't exist (What?!),
Or giving a spider a shower.
Surfing the time vortex, creating screwdrivers,
That save you from the Cyberman's reign (Way to go!).
Finding a fireplace, saving the planet, Earth,
Or driving your companion insane! (Doctor!)

As you can see, there's a whole lot of stuff to do,
Once we answer the call (Allons-y!).
So stick with us cuz Phineas and Ferb are gonna do it all!
So stick with us cuz Phineas and Ferb are gonna do it all!
(Mom! Phineas and Ferb are making a crossover!)

It started as any normal day. Well, as normal as you can get with the Flynn-Fletcher brothers. Phineas and Ferb were lying under the shady tree in their backyard, looking at the clouds through breaks in the branches. They already built a rollercoaster – twice – so they decided to do something different this time, as fun as rollercoasters are. Now if only they could find out what.

Phineas sighed, "Ferb, do you have any ideas? My mind is blank."

Ferb only shrugged in reply.

Phineas sighed again. Then he thought of something. "Hey, Ferb, I know what we're going to do today!"

Ferb looked at Phineas.

Phineas looked at Ferb, then said, "Man, I forgot it already."

Ferb sighed.

Suddenly, Phineas heard an unfamiliar sound. But to Ferb, it was a sound that was all too familiar. A mechanical voice that was too far to make out what it was saying, but what reached them sounded something like "e . . . e . . . t . . . !"

However, it wasn't the words that mattered as much as the voice. Okay, the words mattered a lot, but it wasn't the only thing that could determine what the mechanical robot really was.

"Hey, what's that?" Phineas asked. "Let's go check it out!" He started running toward the sound, but Ferb's hand on his shoulder stopped him. Ferb shook his head. "W-well, okay, if you say so."

Ferb took his hand off of Phineas and took out his phone.

"Hey, Ferb, what are you doing?" Phineas asked.

Ferb held his index finger up, signaling for Phineas to wait. Isabella came in through the gate, followed by Buford and Baljeet, and asked, "Whatchya doin'?"

"Shh," Phineas responded, "I think Ferb is calling someone."

"Well, who's he calling?"

"That's just it, I don't know."

"Shh," Ferb said. Then he turned back to the phone.

The rest of the gang waited in silence. Then, the person Ferb was calling finally seemed to pick up.

"Yes, it's been a long time," Ferb said. "Almost too long." They waited for a few times. Ferb seemed to hesitate, then said, "I think it might be better if you come here . . . Yes, I know, but this is urgent. They are, after all, you're greatest enemy . . . Yes, they are . . . Thank you. Goodbye."

"Who was that?" Buford asked.

"You'll see," Ferb replied.

A noise came from the inside of the house and Candace burst out the back door. "What are you two doing?!" Candace demanded.

"Well, right now we're waiting for Ferb's friend to come by," Phineas said.

"Hm," Candace said, looking at the gang. "Carry on," she added, taking out her phone. "Hey, Stace! Yeah, I know right? I mean, what on earth was he doing?"

Suddenly, a scraping, whooshing sound filled the Flynn-Fletcher backyard. "What is that?" Candace asked.

"Who knows?" Phineas replied.

"Hm," Candace replied, "Stace, I'm gonna have to call you back."

An object slowly materialized under the tree and the noise stopped when it was fully there.

"Is that what I think it is?" Candace asked.

"Yes," Ferb replied, "A blue police box."

The door of the police box opened and a man with brown hair and eyes, wearing a brown pinstriped suit with a white shirt and brown tie underneath, along with red and white converse for shoes, stepped out.

"Hello, there. I'm the Doctor."

"Doctor who?" Phineas, Isabella, Buford, Baljeet and Candace asked.

So, what do you think? And if anyone doesn't know for sure, that is the 10th Doctor. I'm probably going to be updating this weekly, as I'm also working on another crossover (DN Angel and Detective Conan/Case Closed. It's called The Phantom Thief Race) that's being updated daily. Since I was working on that one first, this one will be more like a secondary one, even though the idea for this one came first.