Hero with a Thousand Faces is the 33rd episode of Trollhunters.
While trying out some different stones for his armor, a yellow stone makes clones of Jim, and at a bad time too: Jim is attending a BBQ for Claire's mom to win her parents over after what happened with NotEnrique. When one reckless clone runs off with the amulet, Jim and the Jims must stop Hunter Jim before it's too late.
It is revealed that Claire's mother is the mayor of Arcadia.
There are different color jackets for each Jim clone: