Sarge Steel is a detective/spy character published by Charlton Comics during the 1960s. As he was published during the time of Charlton's Action Heroes line of superheroes, and had loose ties to some, he is sometimes included with that group. He was purchased by DC Comics along with the other "Action Heroes".
Sarge (short for "Sargent," as in "Sargent Shriver") Steel has a mechanical left hand. As Dick Giordano stated in the editorial page of L.A.W. #4 he was created by Pat Masulli,and later written and drawn by Joe Gill and artist Dick Giordano. Other artists, including the team of Bill Montes and Ernie Bache, would later take over.
His enemies included characters like "The Lynx," "Ivan Crunch," "Smiling Skull" (a Nazi villain who fought Judomaster during WWII), Werner Von Wess, Mr. Ize, and others.
Sarge was originally a hardboiled private eye (in fact, in the book The Fine Art of Murder, Max Allan Collins notes that Steel was the first fictional private eye to be a Vietnam veteran), who somehow also got involved in "spy cases," and became by issue #6 a "Special Agent." The final issues were titled Secret Agent, even though Gold Key Comics also published a comic of the same title in 1967 based upon the television series, Danger Man.
Around this time, the manipulative, catepillar-shaped alien criminal Mr. Mind is handed over to Steel's custody. Mr. Mind takes control of Steel, hiding inside his artificial hand in order to escape the detection of superhumans. Controlling Steel, Mind causes the nuclear devastation of the midwest American city of Fairfield. Though superhumans contained the bombs to the literal limits of the town, many thousands died.
Steel has since resumed his old Cabinet posting as a member of the Horne Administration. He is currently in charge of Nemesis and Diana Prince as part of the Department of Metahuman Affairs. During his time at that post the villain Circe kidnapped Steel, tied him up, duct taped his mouth shut, locked him in a closet, and had him replaced with her shape-shifting henchman Everyman. Using Steel's pull at the agency, Circe and Everyman helped bring about the events of Amazons Attack.
In the end, Steel is freed, but he's left overtly suspicious over Wonder Woman's motives, questioning she may still serve the Amazons cause, to him perceived as harmful and dangerous. He correctly guesses the love story buddying between Nemesis and Wonder Woman, and so decides to keep Diana and Tresser in constant surveillance.