Superboy and the Legion of Super-Heroes #210

Story 1: Soljer's Private War. Soljer is a soldier of World War VI and sacrificed himself to save his troop by throwing himself on a gamma bomb that was immediately struck by lightning. The troop buried him, not realizing that the energy from the bomb and lightning kept him alive. He is resurrected and mistakingly attacks the Legion, but they defeat him. Story 2: The Lair Of The Black Dragon. The origin of Karate Kid is revealed. Both stories are  reprinted in the the Legion of Super-Heroes Archives #11