The Amazing World of Gumball: The Signal/The Grades/The Best/The One

When Darwin asks for his advice on hats, Gumball suddenly can't speak and offends Darwin. Darwin is convinced Gumball said he had a fat head./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!/No matter what Gumball does, Carmen thinks she knows better. Gumball attempts to gain the moral high ground but fails... The only option left is to bring Carmen down to his level./Tobias tries to be Gumball's best friend.