Teether is a member of the Trenchbillies in the episode "Trenchbillies."
Teether is a large purple trenchbilly with only one eye. He also wears blue overalls and a white shirt.
It is revealed that he is good at playing Banjo when he challenged SpongeBob and Patrick in a music challenge. Patrick then made his own banjo out of string and SpongeBob and Teether and Patrick begin playing. The two play successfully but Teether soon erupted into stars unknowing what became of him.
He somehow lost an eyeball once.
He bears a resemblance to Nemesis from Resident Evil 3.