Hank Heywood aka Commander Steel is one of the supporting protagonists in Batman: The Brave and the Bold.
Hank Heywood enlisted in the United States Marine Corps during World War II. An attack on the base he was stationed at left his body in ruin. Dr. Gilbert Giles, Heywood's former biology professor, performed surgery on him. He replaced his bones with steel tubing, tough bio-retardant skin, metal plating in his skull, and micro-motors in his joints. Heywood survived and discovered the mechanized steel devices enhanced normal human functions on a superhuman level. He became a superhero named Steel, the Indestructible Man and fought fifth column saboteurs. Steel was then sent to Europe on secret missions. President Roosevelt commissioned him as Commander Steel. Commander Steel can jump far, has limited vulnerability, can stay submerged underwater for up to 30 minutes, lift 1000 pounds, and run 50 miles per hour.