High Quality Content by WIKIPEDIA articles! "It`s About Time!" is the twenty-first broadcast episode of the animated television series Phineas and Ferb`s first season. It originally aired on Disney Channel on March 1, 2008. The episode concerns stepbrothers Phineas and Ferb fixing a time machine on display in a museum and using it to travel back to prehistoric times. Meanwhile, Perry the Platypus deals with being replaced with a panda bear as the nemesis of the mad scientist Dr. Heinz Doofenshmirtz.