Ep 13. Bloooo

In Foster's Home for Imaginary Friends season 1 episode 13, titled "Bloooo," the gang at the home discovers that Mac's creation, Blooregard Q. Kazoo, is a fan of a fictional superhero named "Imaginary Man." After a marathon of watching the show, Bloo becomes convinced that he is Imaginary Man's sidekick.

Throughout the episode, Bloo insists on accompanying Imaginary Man on his missions to save the day. But when it becomes clear that there is no actual Imaginary Man, but rather a group of teenagers in costumes, Bloo becomes disillusioned and decides to quit superhero-ing altogether.

Mac and the other residents of Foster's Home try their best to cheer Bloo up, but nothing seems to work. That is, until Eduardo accidentally locks himself in the bathroom, and Bloo must use his "superhero" skills to break him out.

In the end, Bloo learns that he doesn't need to be a "real" superhero to do good in the world, and engages in small acts of kindness throughout the remainder of the episode. The theme of the episode is about finding the superhero within oneself, and the importance of small acts of kindness in making a positive impact on the world.