The Grades / The Diet

S5 E112: The Grades: Miss Simian discovers a failed test from Gumball's past that brings down his grade point average. This means he has to retake kindergarten all over again, much to her delight. But by demoting him Miss Simian has inadvertently brought herself down, and they're left with no choice but to team up if they want things back to normal. / The Diet: Gumball and Darwin discover the reason Dad's diet wasn't working was that he was actually on ten diets and eating a meal for each of them. They eventually manage to help him lose weight, but Richard's newfound buffness also brings out his more obnoxious side.