The security guard is a character who appears in the episode "Krusty Kleaners."
The security guard is an olive green fish who wears a navy blue hat and shirt, both with golden badges on them, and has a purple fin.
Role in series
Before SpongeBob and Patrick go to the office, the security guard is seen getting out, calling his mom. His mom is telling him to double check if the doors are locked, though he decides not to and wants his mom to stop nagging him.
At the end, he reappears after the building has been destroyed and quits on the spot.