Mr. Nesmith is Jimmy's Planet Sheen counterpart. Apperently his brain cells have been enhanced after he broke into Zeenu's atmosphere. There's way more to this Chimp than a name tag. He is a master of all things intellectual including math, science and sudoku. He has been camping out on Zeenu since his rocket crashed there back in the '60s. He may not be the most patient chimp when it comes to Sheen's antics, but he is the one person who can help Sheen get home and repair the rocket.
Mr. Nesmith's character came from Micheal Nesmith from the Monkees. He wears a wool hat just like the real Nesmith did.