When Worlds Collide

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. Doofenshirmtz hopes to steal the world's largest ball of twine.

Songs

 * Whalemingo
 * Double Dutch

The "Too Young" Line
None.

Whatcha doin'?
None.

Perry's entrance to his lair
None.

Background Information

 * This episode takes place right after "Gi-Ants".

Production Information

 * This episode will air on Disney Channel on Demand on September 7, 2012

Continuity

 * Fourth episode where the first scene is at Doofenshmirtz Evil Inc. ("Hail Doofania!", "A Real Boy", "The Remains of the Platypus")
 * Fourth episode to remain at night the entire time ("Traffic Cam Caper", "Candace Gets Busted", "That's the Spirit").
 * When Phineas looks through the telescope, the first thing he sees is the Shooting Star Milkshake Bar. ("Out to Launch")

Allusions

 * The episode title is a reference to the 1933 science fiction novel, which was made into a movie in 1951.

Cast

 * Vincent Martella as Phineas Flynn
 * Ashley Tisdale as Candace Flynn
 * Thomas Sangster as Ferb Fletcher
 * Caroline Rhea as Linda Flynn-Fletcher
 * Mitchel Musso as Jeremy Johnson
 * Dan Povenmire as Heinz Doofenshmirtz
 * Jeff "Swampy" Marsh as Major Monogram
 * Richard O'Brien as Lawrence Fletcher
 * Dee Bradley Baker as Perry
 * Bobby Gaylor as Buford