Andrew "The Great" Paris was an actor, a magician and a master of disguise who was a member of the Impossible Missions Force. He appeared in Seasons 4 and 5, taking over
The Great Paris

Leonard Nimoy as Paris.

for Rollin Hand in this capacity. (Martin Landau and Barbara Bain had left after Season 3.) Acting him out was The Late Leonard Nimoy, who had become most famous for his role as Spock on Star Trek.