Bikini Bottom Marathon Number Seven is a male competitor in the Bikini Bottom Marathon. He appears in the episode "Code Yellow."
He is a green fish with blue fins and wears a red and white sports suit, red shorts, and red and white shoes. He has a red headband, a jersey on with the number 7, and red pants. He is a frequent runner and is preparing to be in the Bikini Bottom Marathon.
He first appears when he is in his room in the Bikini Bottom Hospital, saying he broke his legs and asks if he will be able to participate in the marathon next week. SpongeBob fixes his legs by stuffing a fish skeleton into his body, although they appear backwards. However, he breaks his legs again when SpongeBob runs him over with Mrs. Puff's out-of-control iron lung.