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 EditionsCharlton Heroes of the 1960s: Volume 2 (#1, 51)Charlton Heroes of the 1960's: Volumes 1 & 2 (#1, 51)
— Description from Comic Vine community (comicvine.gamespot.com · https://comicvine.gamespot.com/thunderbolt/4050-2329/).
