Just a Cartoon

The Game's Main Bosses are Ice King,Lumpus,A Corrupted Muscleman and Skips,Truffles,Grim and Nergal,and Mojo Jojo.

Playable Characters(DS)

 * Finn
 * Mordecai
 * Rigby
 * Benson
 * Lazlo
 * Chowder
 * Billy
 * Blossom
 * Bubbles
 * Buttercup
 * High Five Ghost(Unlockable)
 * Jake(Unlockable)
 * Princess Bubblegum(Unlockable)
 * Clam(Unlockable)
 * Mung Daal(Unlockable)
 * Mandy(Unlockable)
 * Nergal Jr.(Unlockable)
 * Dexter(Unlockable)
 * Johnny Bravo(Unlockable, Only During the "Bravo and The Ghost" Mission unless you hack to make him instead of Mandy show)
 * Nightcrawler(Easter Egg, only available on Holidays except Christmas)

Playable(All other systems)

 * Finn
 * Mordecai
 * Rigby
 * High Five Ghost
 * Benson
 * Pops
 * Lazlo
 * Raj
 * Chowder
 * Shnitzel
 * Billy
 * Irwin
 * Blossom
 * Bubbles
 * Buttercup
 * Jake
 * Dexter
 * Mandy
 * Nergal Jr.(Unlockable)
 * Mung Daal(Unlockable; not playable in "Mathmatical Fight" or "Truffles" mission)
 * Johnny Bravo(Unlockable, Only During "Bravo and The Ghost", "Ice King" and "Mathmatical Fight" Missions)
 * Jonny 2x4 and Plank(Unlockable)
 * Nightcrawler(Easter Egg, only Playable on Holidays)

Story Mode Missions
"Adventure Protection" - Play as Finn or Jake(Not on DS)

"What Happened to Muscle Man" Play as Mordecai,Rigby,or High Five Ghost(Not on DS)

"Camp Kidney's Missing" - Play as Lazlo or Raj(Not on DS)

"Blurple Nurples" - Play as Chowder or Shnitzel(Not on DS)

"We are The X-Men" - Play as Nightcrawler(Bonus Mission)

"Billypuff Girls" - Play as Billy,Blossom,Bubbles,Buttercup,Mandy,or Irwin(Not on DS)

"Look, Plank!" Play as Jonny 2x4(Not on DS) and Plank(Not on DS)

"Mandark Rivalry" Play as Dexter

"Bravo and The Ghost" - Fight as HFG against JB, and then once you win you can pick HFG or JB

"My,Dear Warrior" - Play as Princess Bubblegum(On DS)

"Find the Slackers"- Play as Benson

"Demon Slayers" - Play as Rigby or Nightcrawler(Bonus Mission)

"Mathmatical Fight" - Play as Jonny 2x4 and Plank(Not on DS), Billy,Irwin(Not on DS),Blossom,Buttercup,Finn,High Five Ghost,Mordecai,Benson,Pops,Nightcrawler(Bonus),Lazlo,Chowder,Johnny Bravo(Not on DS),or Dexter

"Truffles" - Play as any character except Mung and Johnny

"Skips" - Play as Mordecai,Rigby,Benson or Pops(Not on DS)

"Mojo Jojo" - Play as any character except Johnny Bravo

"Magneto" - Play as Nightcrawler(Bonus)

"Muscle Man" - Play as High Five Ghost(Special Dialouge with HFG)

"Grim" - Play as any Billy & Mandy Character except Nergal Jr.

"Nergal" - Play as anyone except Johnny Bravo, and the Billy & Mandy Characters(Nergal Jr. is playable)

"Lumpus" - Play as Lazlo

"Ice King" - Play as anyone(Special Dialouge with Finn,Jake,High Five Ghost,and Raj)

"Muscle Power" - Play as anyone

"I am Nightcrawler" Special DS Bonus Mission

Ratings
"It's Fantastic!The Fight Addition was excellent, and Nightcrawler's appearence surprised me who thought Marvel would let CN you him."

"Its The Best Game I have ever played, I like the selection of characters and the thought of corruped heroes(Muscle Man and Skips) I would like to see a Crossover Game between Adventure Time and Regular Show Next"

"You Know Who Else Liked It?MY MOM!" - Muscleman