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When a failed test grade brings down Gumball's grade point average, Gumball is forced to return to kindergarten.
When Dad gives Larry's hairdresser a bad review for saying he's bald, Gumball and Darwin are inspired to go on a reviewing spree across town, forcing Larry to give them stuff with the threat of a bad review.
Gumball and Darwin find out why Dad's diet was not working, and after they help him lose weight, Richard becomes more obnoxious.