This shall be the final chapter. I finished a story, woohoo! Hope you all enjoyed!

Disclaimer: I do not own Phineas and Ferb nor TMNT. TMNT belongs to Kevin Eastman and Peter Laird; Phineas and Ferb belong to Jeff "Swampy" Marsh and Dan Povenmire.

Collision

Departure

Donatello sighed as he put finished adjusting the little system. "Not really. Do I have to?"

"You sound like a five-year-old," Ferb commented. It was the first Don had heard him spoke; the green-haired boy had a British accent, which Don would have asked about had he the time to do so.

"Hey, I'm stressed," the Turtle protested. "I just wanna go home~."

Phineas had to keep himself from giggling, while Isabella just burst out into a fit of giggles. Ferb rolled his eyes, and Baljeet snorted.

"Alright, whateva," Buford grumbled. "C'mon, let's get this show on the road!"

"Okay, then, Phineas," Donatello said, checking his watch. "Fire it up in three...two...one...!"

Leonardo quirked an eyebrow at Raphael and Michelangelo. "Are you guys sure?"

"Positive," Raph grunted as he finished adjusting the portal stick.

"Oh, it'll work, Leo," Mikey said, popping his head out from under the table; Leo wasn't sure how his youngest brother had gotten there or what he was even doing down there. "And when it does, you can NEVER touch another toaster!"

"It wasn't my fault the last five toasters exploded!" Leo protested. "They just...uh...Donny tinkered with them or something!"

"Hey, don't blame the braniac when he's not here, Fearless," Raph said, shaking his head. "And besides, that's not the point. We've gotta get said Brainiac back!"

Leo cracked a grin. "Alright," the oldest Turtle said, checking his watch. "Mikey, fire it up...NOW!"

Don shielded his eyes from the flash. "Did it do this before?" he asked, shouting over the whirr of the machine.

"YEP!" came Phineas's reply. The noise died down slightly, and Don took a chance and approached the portal.

"Well?" Isabella inquired after a moment. "Did it work?"

"Buford wanna know!" Buford added. Baljeet rolled his eyes.

"Now you sound like a five-year-old."

"Watch it, nerd."

"It's home!" Don exclaimed, pulling back after a second. His chocolate eyes were sparkling. "I'm going home!"

"Hey, don't we get goodbyes first?" Phineas asked, the hint of a laugh in his voice. Don chuckled as Perry chattered, seconding Phineas's request.

The Turtle held out a hand for Phineas first, and the red-head took it with a grin. As Don went from one kid to the next, he said, "Thanks, guys...for everything. I might not be getting home if it wasn't for you." He ended by patting Perry on the head before rising and turning to the portal.

"Hey," Phineas said, making Don hesitate for another second. "It was fun. I'm glad we met, Donatello."

Don shot a grin back over his shoulder, before waving and jumping through the portal without another word.

The purple-banded Turtle landed with a grunt. He stumbled, but before he could fall dark green hands caught him.

Don looked up into the amber eyes of his hot-headed brother, and broke out into a grin. "Raphie!"

"Donny!"

"Donny, woohoo!"

"Welcome back, Don!"

The braniac suddenly found himself in a crushing group hug, his brothers all talking at once. He laughed. "Hey, guys, I missed you too!"

"Never, NEVER, do something like that again!" Leo said, breaking away. His smile had melted into a stern frown, and Don smiled sheepishly.

"Aww, Leo, you know I'd never do something like that on purpose," he said.

"Could'a fooled me," Raph commented.

"The important thing," Mikey said, hugging Don again, "is that you're back, Don!"

With a chuckle, Don hugged Mikey back. "It's good to be back, Mikey...it's good to be back."