Creighton the Cretin is a comic strip created by Greg in book one. Greg created the character after Rowley left with his Zoo-Wee Mama comics. The strip is about its eponymous character who does all sorts of imbecilic things and gets scolded for them, such as eating a math test, putting a muffin in a DVD player, thinking it was a toaster, and believing that his name was "Stew Pid" (pun on stupid). Greg writes one of the aforementioned comics for his school paper, but it is ruined by Mr. Ira, causing him to quit the paper because of rising unpopularity caused by it. It is later featured in the second and do-it-yourself books.