"The Ghost is Clear" is the fifteenth episode of the first season of Squiddly Diddly, which is also a segment of The Atom Ant/Secret Squirrel Show. It originally aired on NBC on January 8th, 1966.
Wilbur, a little ghost, is alone, and it's his birthday. His parents are out house-haunting, so he invites Squiddly to a birthday party. However, Squiddly has no idea, until he shows up, that is, that Wilbur is a ghost.