Though his creation was not shown like Jellion Squidward and Jellion Patrick's, it could be assumed that Jellion Mr. Krabs was created when SpongeBob helped Jellion Patrick deliver the caught Jellions to all of their friends. He makes his first appearance after a guy who was not a Jellion orders a Krabby Patty with mayonnaise. Jellion Mr. Krabs then tells the guy that they do not serve mayo, then places a Jellion on the guy's head. After knowing SpongeBob had discovered the Evil Alien Jellion Overlord, Jellion Mr. Krabs attempts to plant a Jellion, to no success. He then tells SpongeBob to go home and get some rest, actually hoping that the other Jellion Clones will get SpongeBob and turn him into a Jellion. He then discovers SpongeBob and Sandy trying to sneak in with fake eyes and shouts out "IMPOSTORS!", alerting the other Jellions to attack the two. He is eventually defeated when SpongeBob squirts him with mayonnaise.
Next to the Evil Alien Jellyfish Overlord, Jellion Mr. Krabs actually acts more of a leader to the other Jellion clones. Unlike the real Mr. Krabs, Jellion Mr. Krabs has more of an obsession to help create other Jellions rather than to receive any money. He also seems to be more in a good, less serious mood unlike the other Jellion clones especially Jellion Patrick.
"I am sorry, valued customer. We're currently out of the condiment you call mayonnaise. Please accept this free jellyfish hat instead. Thank you, come again!"
"You look tired, SpongeBob! Why don't you go home and take a nap?"
"Did you take that nap, SpongeBob?"
"[last words] AAA! Ew..."
Like the real Mr. Krabs, he is voiced by Clancy Brown.
The back of his eye stalks are completely black.
In all the scenes Jellion Krabs is shown in, he tends to have a common pose, and does not move much when he is in the Krusty Krab.
When Jellion Krabs is in his office before the normal fish asks for one Krabby Patty with mayonnaise, it is unknown what Jellion Krabs does, considering the fact that Jellions do not know he is a cheapskate and counts money all day, because Jellions do not use money.
He replaced Mr. Krabs as the manager of the Krusty Krab temporarily.