When the study group discovers that the yam they were growing for Professor Kane’s biology class has been knocked to the floor & smashed, Shirley orders Troy & Abed to investigate. After questioning Pierce & Todd, they learn that Magnitude had the lab key on the night of the crime. Once they track him down, he tells them that he lost the key when his backpack was stolen in the library. Troy & Abed set up a sting operation to catch the thief & discover that Star-Burns broke into the classroom to steal equipment for his meth lab. But when he tells them that he saw Todd fleeing the scene, they agree to keep his secret.