 " It 's About Time ! " was written and directed by series co @-@ founder Dan Povenmire , and storyboards were constructed by multiple artists in the show 's production staff . The writers purposely left the time machine available to the boys at the end of the episode in order to reuse it later in the series , which they did in the season 2 episode " Phineas and Ferb 's Quantum Boogaloo . " Critical reception was generally positive , and multiple reviewers applauded Perry and Doofenshmirtz 's relationship in the episode , which they noted was portrayed with possible homosexual subtext . 
