Monkey Face is an alien gladiator who fought in the Tri-Sports Arena games.
In the 2003 TV series episode "Turtles in Space, Part 4: The Arena", Monkey Face was ordered by Gruell to fight the turtles in the slave pen, along with Traximus, Fists, Paz, and the Twins. He fought against Donatello but was ultimately defeated by Raphael. Later in the arena, he was ordered by Zanramon to fight the turtles to the death, but refused.
Monkey Face also appears as an enemy in the game Teenage Mutant Ninja Turtles 2: Battle Nexus.