Jellien Patrick greatly resembles the real Patrick Star except he has dark, reflective, round eyes. This is a common trait in the rest of the Jellien clones too.
Jellien Patrick was created after the Evil Alien Jellyfish Overlord created a Jellien after having eaten a jellyfish. The Jellien then ate a sleeping Patrick and carried him away. Jellien Patrick then meets up with SpongeBob, who spots that Patrick caught a Jellien, leading SpongeBob to think it was an ordinary jellyfish. Jellien Patrick then catches a whole smack of Jelliens. He then tricks SpongeBob to give them away to each of his friends. After turning Squidward into a Jellien, Jellien Patrick takes over SpongeBob's position as fry cook at the Krusty Krab where he helps serve Krabby Patties, without the mayonnaise. He was then finally destroyed after SpongeBob sprayed him with mayonnaise when Jellien Patrick and Sandy were about to take on the Evil Alien Jellyfish Overlord.
Jellien Patrick behaves very differently from Patrick. His only course of action is to plant Jelliens on the heads of citizens and turn them into Jellien Clones. Like all Jelliens, Jellien Patrick vehemently despises mayonnaise as when SpongeBob tells him that he was going to get more in the back, Jellien Patrick quickly turns his head around (with his torso still facing the grill) and loudly shouts out "NO MAYONNAISE!"
"Yes. I too have caught many jellyfish. Perhaps we shall give one to each of our friends."
"One Krabby Patty, hold the mayonnaise."
"Pleasant dreams, square one."
"I am here to replace you and all of your kind."
"He will take one and like it."
"Hold the mayonnaise."
Jellien Patrick is likely the first of the Jellien Clones ever created, since the Evil Alien Jellyfish Overlord was first inside a cave.
Jellien Patrick is the only Jellien Clone that has met SpongeBob but didn't try to harm him by any means. All other Jelliens tried to get SpongeBob to wear Jellien hats; some would also hiss or growl at the non-Jellien SpongeBob.
Jellien Patrick was apparently the last of the Jelliens to be destroyed by mayonnaise.