Jellien Squidward is created after Jellien Patrick jams a Jellien through Squidward's mail slot. Then, the Jellien consumes him. Thus, Jellien Squidward is born.
After that, on the next day, Jellien Squidward takes Squidward's place on the register at the Krusty Krab, serving other Jelliens with Krabby Patties without mayonnaise. However, one of the customers wants mayonnaise, to which Jellien Squidward and the other Jelliens viciously hiss at the lone customer.
Jellien Squidward is defeated after SpongeBob and Sandy take down the Evil Alien Jellien Overlord.
Like most other Jelliens, Jellien Squidward behaves much differently from the original. First off, Jellien Squidward seems to smile a bit more than Squidward and most of the other Jelliens except for Jellien Mr. Krabs. Jellien Squidward is also known for his "Rah!"-like catchphrase and says it usually after he serves his customers Krabby Patties without mayonnaise. Also like Jelliens, whenever someone mentions mayonnaise, he reacts hastily, knowing it is his true and only weakness.
Like Jellien Mr. Krabs, Jellien Squidward fully takes over the role that the real Squidward had.