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In "Roller Cowards," Alternate-Universe Patrick calls Main-Universe Patrick a "big fat crybaby." Patrick Star responds by punching him without breaking the glass and says "I thought we settled this the last time!," implying that he and Patrick encountered each other before.
In "Rule of Dumb," AU-Patrick looks like a monster version of Patrick, but with a unibrow, spines on his hunchback, a nose, and large-pointed bottom teeth. Patrick and AU-Patrick can only see each other using a mirror. They can reach into each other’s worlds (proven by Patrick, when he punches AU-Patrick). Patrick and AU-Patrick don't like each other very much.
He also appeared in "The Great Patty Caper" when Patrick suggests that his reflection in the window looks suspicious. Afterwards, the reflection gains an annoyed expression, then walks away.
However in "No Pictures Please", AU Patrick gives the real Patrick the idea to be a tour guide and was shown getting along with him in contrast to their previous interactions.
Role in series
His second recent appearance was in an unnamed SpongeBob comic in the Nick MagazineSeptember2009 issue. In the comic, SpongeBob and Patrick receive a treasure map from an elderly sailor. SpongeBob reminds Patrick of the curse that the sailor told them of. When SpongeBob then tells him about what the sailor said, a bubble comes up with Alternate-Universe SpongeBob, Alternate-Universe Patrick and Alternate-Universe Elderly Sailor reenacting when the sailor giving the map to them. When Patrick denies that even happened, the Alternate-Universe Sailor slaps him and says "Sure I did! Pay attention, sonny!" Then, in the background, Alternate-Universe Patrick is laughing at him and Alternate-Universe SpongeBob is staring at SpongeBob with a blank expression.
"Rule of Dumb"
(Patrick) "Huh? [gasps] A knock-knock joke! [he runs back to the mirror] Who's there?
(AU Patrick): You.
(Patrick and AU Patrick): I don't get it.
"(AU Patrick): I am you and you are ME!!!"
"(Both Patrick and Mirror Monster): AH! WHAT HAVE I BECOME!?"
"(Patrick): It's just a ride. What are you so scared about? You can do it."
"(AU Patrick): No you can't. You're a big crybaby."
"(Patrick): "Oh, yeah? [angrily punches his smug counterpart, without breaking the glass] I thought we'd settled this the last time!"
Unlike Alternate-Universe SpongeBob, who is friendly with his counterpart; Alternate-Universe Patrick is always shown to be evil to his counterpart, as he tells Patrick that he is a crybaby and even laughs at him when he gets smacked by the Alternate-Universe Sailor.