In the series premiere movie, Mac sends Bloo to live at Foster’s Home for Imaginary Friends after being told by his mother that he is too old to have an imaginary friend. There, they meet Mr. Herriman, Frankie, Wilt, Coco, and Eduardo, who all announce that eventually, Bloo will be adopted by another kid. Mac is promised that Bloo will not get adopted if he visits Bloo every day, but they face problems when Mac’s brother Terrence and a fiendish imaginary friend named Duchess want to get rid of Bloo. Now it is up to Mac and his new best friends to join forces and rescue Bloo. They fight an imaginary monster called an Extremosaurus (which resembles a giant spider). The Extremosaurus chases Bloo around the junkyard, like in Pac-Man, but with the help of Eduardo’s bravery, Coco’s eggs, Wilt’s basketball skills, and Mac’s intelligence, they rescue Bloo.