Fred(Incidental 1/Incidental F1) is a background/recurring fish best known for screaming "My leg!" in painful or violent situations. He debuted in the episode "Reef Blower," and his catchphrase is first used in "Boating School." He is featured prominently in the episode "My Leg!."
This character model's name has varied; in most appearances from seasons 1 to 10, he was nameless, except for "Patty Hype" in which Incidental 6 calls him "Fred" in a very brief throwaway line. His name was given as Clint (possibly a reference to Clint Eastwood) in "Big Sister Sam" from season 7. In season 10, the new showrunners re-adopted the name Fred after seeing it on fan-made wikis. They mistakenly believed that Fred was a fan-given name.
In February 2019, Mr. Lawrence said: "Fans started talking about [the 'my leg' gag] and named him Fred." In October 2019, Vincent Waller said, "By that, he means the fans named him and we went, 'That's a good name for him. That'll work.'"Tom Kenny elaborated: "Bask in the power of the internet: the fans named him Fred."
Fred is usually voiced by Doug Lawrence, but in many episodes he was voiced by various voice actors:
His character model appears lavender in "The Sponge Who Could Fly" and blue in numerous other episodes (e.g. "Something Smells"), and lime-green in "Party Pooper Pants". He also wears round glasses in that episode.
In Tutor Sauce he appears blue and is seen eating a Krabby Patty but just stale buns. He then has to pay extra for "emotional patties."
He is prominently featured in the episode "My Leg!" where he tries not to hurt his leg at the risk of getting it placed by a robotic leg. SpongeBob then tries to keep Fred's leg out of harm's way until he finally reveals that he likes to be in the hospital so he can be with Nurse Bazooka (a nurse he is secretly in love with). SpongeBob tries to help Fred by doing many dangerous attempts to purposely hurt his leg, but they just keep failing. When Fred finally ended up in the hospital (after getting run over by the ambulance twice), he sings the song "My Leg is in Love " to show Nurse Bazooka how much he loves her. She enjoys the song and the two end up dating. This episode is Fred's biggest role yet.