Fred is a greenish-brown fish (sometimesblue, grayorlightpurple) who was the first of the generic background character models to appear in the series. He first appears in the episode "Reef Blower" and is best known for screaming "My leg!" in painful situations. He is featured prominently in the episode "My Leg!"
In most episodes, he appears as a greenish-brown- colored fish with light tan fins and black eyes. He wears brown pants and a black belt with a gold-colored belt buckle.
His first appearance is the episode "Reef Blower." However, he is barely seen in the episode, as he is in a boat as SpongeBob zooms past him. He's most often seen dining at the Krusty Krab. He is one of the first two background characters, with Harry being the other.