He first appeared in the episode saying that SpongeBob and Patrick were not allowed in Tentacle Acres. Since SpongeBob and Patrick did not leave, he asked his colleague, Orville, if he had his nightstick ready. The two were knocked out by Patrick`sfried oyster skin breath that had gone through the speaker.
Although unlikely, the gatekeeper may have appeared chasing Squidward as the end of the episode.
He is one, if not the only, gatekeeper that works for Tentacle Acres. He might also be a guard.