"Wow, this sub-basement is amazing!" Donatello's enthusiastic call sounded down the empty hallway. Suddenly, his green face fell. "Crystal would have loved to show me around and prove she knew more about this place than me."

Leonardo put his hand on his younger brother's shoulder. "We'll get her back, Donni. It's gonna be okay."

"I know, Leo, I know. I just really miss her."

Raphael put his green, three fingered hand on Donni's other shoulder. "We all do. An' you can bet your shell we're gonna get her back safe an' sound."

Donni looked at his younger brother and saw the anger in his eyes. He knew Raph would never stop looking until his baby sister was safe.

Unexpectedly, Michelangelo popped up right in front of his three big brothers. His face was turned up into a giant goofy grin and his green eyes sparkled with excitement.

"It's so cool here!" Michelangelo said. "Bobby's so funny. He gets into more trouble that I do!"

"Maybe you should find someone else to hang out with, Mikey," Leo said slowly. "You're enough trouble as it is."

"Am not," Mikey protested. "Okay, maybe I can be a bit of a troublemaker."

Raph's eyes softened and he almost smiled. "You're the biggest troublemaker I know," he said while jabbing his finger at his little brother.

Donni's face brightened as he joined Raph in picking on Mikey. "Yeah, Mikey, you get into more trouble in one day than the rest of us do in a week."

Leo shook his head. "Seems its 'Pick on Mikey Day'. Raph's favorite day of the year."

"I don't like 'Pick on Mikey Day,'" Mikey whined. "Leo, make 'em stop."

"Nuh-uh, Mikey, today is my day ta' pay ya' back for all the things you did ta' me," Raph said with a smirk.

"Oh, shell."

"'Oh shell' is right, little bro. Come here. I'm not gonna hurt ya' that bad," Raph said. He then lunged for Mikey, who ducked out of the way.

"Come on, Raph," Leo said. "If you're gonna do that, go outside. I'm not gonna let you trash this place just so you can have your revenge."

"You will not have any revenge," Master Splinter said from the behind the four brothers. The turtles turned to see their master standing along side Professor Charles Xavier.

"Aw, come on, Master Splinter, can't you look the other way, just this once?" Raph pleaded.

"No. There is no time for revenge. We have found Crystal."

"Wait, did you say you found Chris?" Leo asked excitedly as he stepped toward his master.

"Yes, Leonardo. Now. Come. The other X-Men will join us in the war room momentarily."

Leo, Donni, Mikey, and Raph stood against a blank wall as the X-Men pilled into the small room. Soon, all the metal chairs were filled except for one in between Kurt and Logan. Master Splinter stood next to Professor Xavier. They waited until the room was quiet.

"Now, I think before we start, a proper introduction would help us all," the Professor began. "To my left is Beast, then Storm, Shadow, Nightcrawler, Wolverine, Gambit, Jean, Cyclops, Shadow Cat, Rogue, Jubilee, Ren, Dark Flare, Pyro, Hot Rod, Iceman, Angel, and Havok," he introduced while pointing to each of them. "The man next to me is Magneto."

"I am Hamato Splinter. These are my sons. Leonardo. Donatello. Raphael. Michelangelo," Master Splinter said.

"Now that we have that over with, let's go get Crystal," Professor X said.