Armagheadon is a Cromulon that appeared in the episode Get Schwifty. He is a giant apocalyptic head that confronted the people of Earth, trying to get them to make a hit song for them and then put them on his show, Planet Music. The majority of people in the town (led by Principal Vagina) misinterpreted him as a god and started the religion of Headism to worship him. His name is a pun on armegeddon.