Where's Perry?

A spy mission gone terribly wrong causes Agent P to disappear! Will he ever make it back home or will Phineas and Ferb never see their beloved pet platypus again?

Songs

 * Evil For Extra Credit

Perry's entrance to his lair
None.

Background Information

 * "" is the first half of a major cliffhanger episode that will lead Phineas and Ferb out of its third season and into its fourth. It will be followed by "World Without a Platypus Part 2".
 * The 8 x 8 book based on this episode will be released on June 19, 2012 while the junior novel will be released on July 31, 2012.

Continuity

 * This is the fourth time the word "Platypus" is in the title ("Interview With a Platypus", "Chez Platypus", "The Remains of the Platypus").
 * This is the third time Perry is gone longer than he usually is ("Oh, There You Are, Perry", "Phineas and Ferb The Movie: Across the 2nd Dimension")

Allusions

 * World Without a Superman - The title is a reference to this DC Comics story.

Cast

 * Vincent Martella as Phineas
 * Ashley Tisdale as Candace
 * Thomas Sangster as Ferb
 * Caroline Rhea as Mom
 * Mitchel Musso as Jeremy
 * Dan Povenmire as Dr. Doofenshmirtz
 * Jeff "Swampy" Marsh as Major Monogram
 * Richard O'Brien as Dad
 * Dee Bradley Baker as Perry
 * Tyler Alexander Mann as Carl