While Candace is sick in bed, Stacy takes her place and tries to bust Phineas and Ferb for building a gigantic miniature golf course. Meanwhile, Dr. Doofenshmirtz takes a day off from being evil. --- After watching an old sci-fi movie, Phineas and Ferb are inspired to create a teleportation device which causes Candace and Perry to switch bodies. Meanwhile, Dr. Doofenshmirtz has a grudge against a company mascot.