Kenton of the Star Patrol story from Strange Worlds #4 (Sept. 1951). The GCD credits the art to Wally Wood and Joe Orlando, but it looks more like the work of Orlando with Wood probably doing some key layouts & figure inking. No matter who did what it still looks great!
Five Years early there was another story entitled, Vampires of the Void!, starring the Justice Society of America battling metal-eating monsters from space. No offense to Kenton, but when the chips are down my money is on Joe Kubert's mace-wielding Hawkman.
Go read The Lost Kingdom of Athala by Wally Wood from the same issue as this Keaton story!