Star Trek celebrity guest Dwayne Johnson or The Rock playing The Champion in an appearance on the Voyager episode Tsunkatse. A famous WWE wrestler.
The top picture is the actor in normal circumstances, and the bottom picture(s) is of the actor in their specific role(s).
6 pictures from Tsunkatse
His real name is Dwayne Johnson, and he was one of the best WWE wrestlers in the business. His famous saying is "Can you smell what the Rock's got cookin'", among others. His biggest acting roles so far are in The Scorpion King, The Mummy Returns, The Rundown, Walking Tall and Doom.
Tsunkatse -Star Trek: Voyager - 232 (episode # 6.15) -Playing The Champion -Seven of Nine and Tuvok are captured by an alien named Penk. He enslaves them to fight in a Tsunkatse match where Seven of Nine loses to the Champion.