Perfect Storms (2013)

S2E19 I'm Your Biggest Fanatic

At a jellyfishing fan convention, SpongeBob encounters Kevin C. Cucumber, who invites him to prove himself for membership in his group, The Jellyspotters. Unbeknownst to SpongeBob, Kevin's true intention is to humiliate him. The truth hits hard when SpongeBob finds himself under siege by the club, which unleashes a robotic queen jellyfish to take him down.