In the Spaceman Spiff universe, the titular hero refers more than once to Planet Zog. Whether there are several planets named Zog or just one is unknown, but Zog seems to change every time it is visited. The first time, Spaceman Spiff saw Zog from space, claiming that its "cratered, scarred surface" had never been seen before by Earthlings. This could imply he was the first human to visit it. The second time Zog was mentioned, it was a civilized planet, and the comic.