Ask a Foolish Question

When Candace discovers that Phineas and Ferb have invented a computer that can answer anything, she asks it how she can finally bust her brothers once and for all. Meanwhile, Dr. Doofenshmirtz loses the key to his latest invention, the "Take Over the Tri-State Area-inator," and Agent P must find it before he does.

Perry's entrance to his lair
None.

Background Information

 * http://www.toonzone.net/forums/showthread.php?t=281143

Allusions

 * The title refers to a common phrase/adage "Ask a foolish (or stupid) question, get a foolish answer."

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
 * Alyson Stoner as Isabella
 * Maulik Pancholy as Baljeet
 * Bobby Gaylor as Buford