Mortimer Chauncey "Morty" Smith Sr. of the Prime Dimension is one of the two titular protagonists of Rick and Morty, alongside Rick. He was often incorrectly identified as Morty C-137 until Season 5.

Morty is Rick Sanchez's grandson and was often forced to tag along on his various misadventures as a sidekick whilst attending Harry Herpson High School along with his sister, Summer.[8] At the beginning of the series, Morty was shown to be an incredibly anxious and submissive teenage boy.