Issue #1 is a stand alone one shot, the series starts with #51. Publishing History (#1-48) Mysteries of Unexplored Worlds . (#49-50) Son of Vulcan . (#51-60) Thunderbolt. (aka Peter Cannon: Thunderbolt) Collected Editions Charlton Heroes of the 1960s: Volume 2 (#1, 51) Charlton Heroes of the 1960's:…