Enhanced with a mob boss’s serum, Muscle Man is a man of steel and iron. His gang conducts a train robbery, with Muscles using a giant rock to block the tracks. Aboard the Century Limited, Keith Spencer transforms into Captain Flash and stops it from running into the back of the blocked train. Chasing the fleeing gang, Captain Flash is knocked out by Muscles.

Determined to lure him out, Captain Flash openly challenges Muscle to a fight - the winner taking one million dollars. Flash is able to bare Muscles' blows and manages to take him in the third round.

Muscle Man is super-strong and possessing a degree of invulnerability (he's shown to be bulletproof yet, Captain Flash is still able to knock him out).

*Captain Flash #3
Category:1955 Debuts
Category:Sterling Characters
Category:Comic Book Characters
Category:Male Characters
Category:Mike Sekowsky-Creator
Category:Minions
Category:AC Comics
Category:Real Name Unknown
Category:Eugenically enhanced characters
Category:Steel Themed Characters
Category:Iron Themed Characters
Category:Gwandanaland Characters
Category:PS Artbooks Characters