Duo Force

Duo Force is a series of American animated action adventure comedy crossover movies produced by Walt Disney Pictures and Walt Disney Studios.

Movies

 * 1) Phineas and Ferb in Gravity Falls (2012)
 * 2) School Ninjas (2012)
 * 3) Wander Over Gravity Falls With Phineas and Ferb and the 9th Grade Ninja (2013)
 * 4) Star vs. Phineas and Ferb, Gravity Falls, The 9th Grade Ninja, and The Galaxy (2015)
 * 5) The Ultimate Duo Force (????)