During World War II, Goldstein was given a research lab located in a British hospital. Unconcerned when his experiments caused frequent power drains that endanger the patients, he completes his secret project. He creates the human rocket suit he calls the Blue Bullet.
Unknown to the Allies however, Goldstein is actually a German agent. When he completes the suit, he uses it to attack the superheroic Invaders, who are based in Great Britain. He is stopped when the mighty Sub-Mariner smashes head-on into the rocket costume, crippling it.
Though the Blue Bullet is arrested, his final fate is not documented.
Blue Bullet was created by Roy Thomas, Frank Robbins and Frank Springer in 1976 and first appeared in The Invaders # 11.