Phineas and Ferb

Season 3, Episode 58

Episode Title: When Worlds Collide

Air Date: 2012-09-14

Overview:

After discovering that a strange planet is hurtling directly towards Danville, Phineas and Ferb set out to avert a disaster, while Buford looks forward to making contact with its alien race. Meanwhile, Dr. Doofenshmirtz hopes to steal the world's largest ball of twine.