Peter Lupus

Peter Lupus (born June 17, 1932) is an American bodybuilder and actor. He is best known for his role as Willy Armitage on the television series Mission: Impossible (1966–1973). Description above from the Wikipedia article Peter Lupus, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Cast

Challenge of the Gladiator
Spartacus

Acting on Impulse
Steven Smith

Pulsebeat
Greg Adonis

Hangfire
Sgt. Conlan

Think Big
Bad Guy #1

Hercules and the Tyrants of Babylon
Hercules

Assassination
TV Announcer

Goliath at the Conquest of Damascus
Goliath (as Rock Stevens)
A Fighting Chance
Ray Johnson

The Nutt House
Musso

Muscle Beach Party
Flex Martian (as Rock Stevens)

The Escapist
Unknown

Driving Me Crazy
GM Boss

Giant of the Evil Island
Pedro Valverde

The Brass Bottle
Slave (uncredited)

Mission: Impossible vs. the Mob
Willy Armitage

Mission: Impossible - The Slave
Willy Armitage

Mission: Impossible - Old Man Out
Willy Armitage

Mission: Impossible - The Bunker
Willy Armitage

Mission: Impossible - The Controllers
Willy Armitage

Mission: Impossible - The Falcon
Willy Armitage