Clog is a strange hairy creature living in the Mario Brothers Plumbing house during a few episodes of The Super Mario Bros. Super Show!. He acts as an enemy to the brothers by clogging up pipes (which is where he gets his name) in the Mario Brothers Plumbing building, though he is implied to be a pet of sorts. He has limes for their eyes and is a mess of brown, shaggy hair. In the episode "Toupee", it is shown Clog has the ability to grow back lost hair, as shown with Inspector Klean.
- In "Wild Thing", two Clog-like creatures that may be other members of its species are shown dancing on the refrigerator, though no attention is called to them in the episode.
- In "Fake Bro", when Luigi was about to give Mario a rag at the beginning of the episode, Luigi mistakes Clog for one and briefly apologizes to him as Clog runs off shortly afterwards.
- In "Tutti Frutti, Oh Mario", Luigi thought that Clog was making a noise, so he covered a bucket over Clog temporarily.
- In "Toupee", Mario and Luigi attempt to hide Clog underneath a bucket from Inspector Klean, but fail. Later, he jumps onto Inspector Klean's head and, after Mario and Luigi try and fail to get him off, jumps off and made Inspector Klean's hair grow back.