When Johnny Green blacks out, the Green Mask takes over to wage a one-man war on crime. The Green Mask has superhuman strength, can fly, is resistant to damage and apparently will bust a cap in your ass if need be.
References: [pdsh.fandom.com: Green Mask]
[The Flame #3] [1940] [The Flame #5] [1941] [hero, appearance in advertisement; ]
Metahuman Database 