Stephen Glenn Martin (born August 14, 1945) is an American actor, comedian, and musician, known for his roles in Planes, Trains and Automobiles, Looney Tunes: Back in Action, Three Amigos and Father of the Bride. He is also noted for his frequent collaborations with close friend and fellow actor, Martin Short.
His likeness, along with one for John Candy, appear in "It's A Trap!" parodying their roles from Planes, Trains and Automobiles to the song "Mess Around".
In "Adult Education", after Chris realizes that he's finally found his calling in porn production, he compares his discovery to that of Steve, who in a cutaway is shown putting acting on hold and focusing on his banjo-playing.