|First Appearance||"I'm Your Biggest Fanatic" March 7, 2001|
Kevin C. Cucumber is the leader of the Jellyfish Spotters and the main antagonist of the episode "I'm Your Biggest Fanatic." He was speaking at a jellyfishing convention, in which SpongeBob and Patrick attended. SpongeBob was a big fan of him, and would do anything Kevin told him to do. One day, he invited him to go jellyfishing with the Jellyspotters. He tricked SpongeBob into thinking he could join their club if he passed certain tests, simply so that he could humiliate and belittle him. This seems to be a habit of his, as many of his biggest fans have ended up stranded in a crevasse at Jellyfish Fields because of him.
He made a cameo appearance in Nicktoons Unite! as a statue in the Jellyfish Fields.