When Friends Collide

When Friends Collide is an upcoming episode and a crossover between Disney Channel's Phineas and Ferb, Adventures of Sonic the Hedgehog, Kim Possible, Disney Junior's Fireside Chronicles: Teamwork is Magic, Disney Channel/XD's Star VS. The Forces of Evil, Marvel's Avengers Assemble, and Discovery Family's My Little Pony: Friendship is Magic. It's Rated TV-G for mild thematic elements and some action.

Plot
When Thanos steals all the friendship stones and the Friendship Gauntlet, the Heroes and Heroines of Disney Channel and Discovery Family have to save the friendship stones before it's too late.

Phineas and Ferb, Adventures of Sonic the Hedgehog, and Fireside Chronicles: Teamwork is MagicMagic

 * Alyson Stoner as Isabella Garcia-Shapiro
 * Vincent Martella as Phineas Flynn and Classic Sonic (speaking)
 * Thomas Sangster as Ferb Fletcher and Doctor Ferb Fletcher (speaking and singing)
 * Cindy Robinson as Candace Flynn (speaking)
 * Ashley Tisdale as Candace Flynn (singing)
 * TBA as Dr. Heinz Doofenshmirtz (speaking)

Avengers Assemble and Kim Possible

 * Adrian Pasdar as Tony Stark (post-credits scene: voice only.)
 * Travis Willingham as Thor Odinson (speaking cameo)
 * Roger Craig Smith as Steve Rogers (Speaking cameo)
 * Laura Bailey as Natasha Romanoff and Kimberly Ann "Kim" Possible
 * TBA as Dr. Drakken

My Little Pony: Friendship is Magic and Star VS. The Forces of Evil

 * Tara Strong as Twilight Sparkle