Phineas and Ferb: Invasion of the Ferb Snatchers/Ain't No Kiddie Ride

After an all night science-fiction movie marathon, Candace is convinced that Ferb is an alien and gathers evidence to prove it.  The boys admit that they are doing something for an alien but that Ferb is not one. Her relief turns to excitement and then to frustration when her plan to bust her brothers is compromised by the alien disguised as Mom. Meanwhile, Dr. Doofenshmirtz is trying to sell an evil "-inator" under the guise of it being a cleaning device./ Phineas and Ferb decide to trick out the kiddie rides in front of the Tri-State Mart. Determined to bust them, Candace sits in a rocket ride so it can't go anywhere until Mom shows up. Needless to say, the ride shoots off and Candace ends up on a high-flying rocket across Danville. Meanwhile, Dr. Doofenshmirtz plans to leave behind a legacy by burning his name into the atmosphere using his ozone "deplete-inator."