Quietest Day Ever

After Mom asks the kids to keep quiet while she prepares for her online knitting test, Phineas and Ferb create ninja outfits designed to hide the wearer from anyone who is not wearing them. Meanwhile, Candace becomes increasingly frustrated after she can’t find the boys and bust them. Across town, Dr. Doofenshmirtz invents the De-Handsome-Inator.

Perry's entrance to his lair
None.

Background Information

 * http://tvlistings.zap2it.com/tv/phineas-and-ferb-quitest-day-ever-doonkleberry-imperative/EP009488470271

Continuity

 * The title resembles The Best Lazy Day Ever.
 * Doofenshmirtz creates a device that will make people ugly again ("The Best Lazy Day Ever").
 * The picture near the bathroom with Phineas and Ferb holding Perry is seen again. ("Mom's in the House")

Allusions

 * Spider-Man - When Candace announces that "My busting senses are tingling", it is similar to Spider-Man's motto "My spider senses are tingling."

Cast

 * Vincent Martella as Phineas
 * Ashley Tisdale as Candace
 * Thomas Sangster as Ferb
 * Caroline Rhea as Mom
 * Alyson Stoner as Isabella
 * 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