First Appearance: Invaders #7 (July 1976).
Appearances: Invaders #7.
Years Active: 1914-?
Sir Steel, a Brit clad in a full suit of medieval armor (full plate), was a costumed hero active for the British against the Germans during World War One.
Early in the war he became a member of the Freedom's Five, and served with them throughout the war.
His sidekick was Silver Squire, but apart from that little is known about Sir Steel, including his real identity, his fate after WW1 ended, and his powers, if any.