Episode Title:What Do It Do? - Atlantis.Episode Description:What Do It Do?: When one of Doofenshmirtz's inventions lands in their front yard, Phineas and Ferb try to figure out what it does. Meanwhile, Dr. Doofenshmirtz and Perry get trapped on board Doof's Floating Platform as it goes out of control with no one steering.
Atlantis: On a trip to the beach, Phineas and Ferb discover the lost city of Atlantis, Candace enters a sand castle building contest judged by Jeremy and Dr. Doofenshmirtz tries to use a growth formula to turn plants evil.