Cletus has been seen at a number of places. He was in many eposodes in season 7 and 9. Yet he was also seen in seasons 5, 6, 8, and 10 also. Here are the sightings I've jotted down of him. He has been seen at Itchy and Sratchy Land, buying pretzels from Marge, on the top of a phone line, in his outhouse being destroyed by garbage, going into "Le Maison Derriere", watching Stampy and mocking Lisa while there, buying closes at the place Marge got her Chanel dress at, the side of the road helping Lisa get home (she runs off before he can take her home.), working for Cecil Terwilleger, at the judgement day predicted by the "Angel", at an NRA meeting, at the parenting class Marge and Homer had to go to, getting his drivers license from Patty and Selma, beating Homer's team in bowling, at his dirt farm where the "Leader" falls, at the soccer riot, at the carwash giving his kids a bath, and at the Springfeild Lake eating with his kids.