The super benji movie 3 is about the heroes trying to live life retired, but then one of the members finds out he is related to one of noah's college students via a blood test, then dr banana and minion try to destroy the world with AI, causing the league of grace to come out of retirement. They know that Jonah's dead and they can't do this without him, so they build a time machine in an attempt to stop the events that led to his death, and then things get crazy.