Seymor is a Blue Tentacle Ghost, and one of the two members of the slimy duo, known as The Creepies. He and his red brother, first appeared in the episode Nobody Knows. In the episode, him and his brother are hired by Betrayus to get him the Repository from the The Round House. They succeed and are able to escape to the Netherworld, where an angry Betrayus scolds them, as he is unable to open it. He orders Seymor and his brother to figure out how to open the Repository, and to keep a low profile, to prevent other ghosts from finding out that the Repository is in the Netherworld. Eventually, Pacster, Cylindria, Spiral and the Ghost Gang (in the body of a Pac-Person) catch up, and grab the Repository from them and flee. As Seymor and his brother pursue them, they get stuck in between a door, as they both try to go through it at the same time. It is unknown where they are for the rest of the episode. Seymor and his brother have also made many minor appearances in other episodes, such as Meanie Genie, Cosmic Contest and a few others.