Scooby-Doo/Avengers Assemble/X-Men Evolution/Teenage Mutant Ninja Turtles: ???

When the Scooby gang are on a trip, they meet the Avengers, when the Mandarin threatens to wipe out America, and the Shredder is in league with them. And they work with the X-Men and the Ninja Turtles to stop them.

Characters

 * Scooby-Doo (Frank Welker)
 * Shaggy Rogers (Matthew Lillard)
 * Fred Jones (Frank Welker)
 * Daphne Blake (Grey DeLisle)
 * Velma Dinkley (Mindy Cohn)
 * Avengers:
 * Iron Man (Adrian Pasdar)
 * Captain America (Roger Craig Smith)
 * Thor (Travis Willingham)
 * Hulk (Fred Tatasciore)
 * Hawkeye (Troy Baker)
 * Black Widow (Laura Bailey)
 * Falcon (Bumper Robinson)
 * X-Men:
 * Cyclops (Kirby Morrow)
 * Jean Grey (Venus Terzo)
 * Spyke (Neil Dennis)
 * Wolverine (Scott McNeil)
 * Storm (Kirsten Williamson)
 * Rogue (Meghan Black)
 * Beast (Michael Kopsa)
 * Shadowcat (Maggie Blue O'Hara)
 * Nightcrawler (Brad Swalie)
 * Iceman (Andrew Francis)
 * Colossus (Michael Adamthwhite)
 * Angel (Mark Hildreth)
 * Gambit (Alessandro Juliani)
 * Havok (Matt Hill)
 * X-23 (Brit Irvin)
 * Leonardo (Mike Sinterniklaas)
 * Raphael (Frank Frankson)
 * Michaelangelo (Wayne Grayson)
 * Donatello (Sam Riegel)
 * Mandarin (Oded Fehr) - the main antagonist, and Iron Man's arch-enemy, he has been setting bombs around the world
 * Suspects:
 * Aldrich Killian (Santino Fontana) - Daphne's ex-boyfriend, after she left to join the gang after their first mystery, he is the inventor of Extremis, Reason: Fred chooses him as a suspect because he believes he is stealing Daphne from him
 * Maya Hansen (???) - Tony's ex-girlfriend

Culprit:

 * Aldrich Killian (Santino Fontana) - Reason: He wanted give Tony what he gave him, desperation, since he couldn't meet him on the rooftop on New Year's Eve

Plot
???