After accidentally destroying Mr. Maellard's mansion, Mordecai and Rigby end up taking over Scoutmaster Lumpus and Slinkman's positions at Camp Kidney while they are on vacation as a way to try and get their jobs at the park back. But their jobs are put on the line when Rigby doesn't take the role as Scoutmaster seriously after forming a friendship with Edward.

Mordecai and Rigby take up residence at Foster's Home for Imaginary Friends after getting fired from their jobs. While they live there, Mordecai and Frankie start to date each other, much to Rigby's jealousy. Meanwhile, Benson starts to miss having Mordecai and Rigby around.

In this sequel to Camp Phineas and Ferb, Phineas and Ferb visit Camp Kidney while on a trip in Prickly Pines, where they work with Lazlo and Raj on another project. Meanwhile, Edward, with Chip and Skip's help, tries to bust the boys. Also, Lumpus works with Doofenshmirtz, who is also visiting Prickly Pines, on an evil scheme, putting Clam's being at Camp Kidney in jeopardy.

Mordecai and Rigby want to participate in a 'Running of the Apes' event, but Benson forbids them from partaking in it because he thinks it's too dangerous. Mordecai and Rigby's multiple attempts at ditching work to participate in the event causes Benson to lose it, as he puts the duo in a dangerous situation.

Lazlo, Raj, Clam, and Scoutmaster Lumpus get stranded in Danville after they get kicked off a plane that was heading for Hawaii. While waiting for help, Lazlo and Raj meet Phineas and Ferb, and help them run a summer camp. Meanwhile, Scoutmaster Lumpus meets Candace, and helps her bust the boys. Elsewhere, Clam goes on a mission with Perry after Clam gets mistaken for a new agent.

When Monty breaks up with Vanessa and Candace breaks up with Jeremy, who are Jeremy and Vanessa going to go out with now? This is a story requested by Shiranai Atsune, and it's also a small birthday present for her.

During his college years, Phineas gets a call from a special girl.

Vanessa tries to ask Johnny out to the prom, but sees him talking to Mindy, therefore making her think that he's cheating on her. Hating to see his daughter so upset, Doof decides to get Vanessa a date to the prom by enlisting the help of a special someone. Guess who that special someone is?