Superman (1939). Certain materials such as lead can block his X-ray vision. Superman can project beams of heat from his eyes which are hot enough to melt steel. He first used this power in "Superman" #59 (1949) by applying his X-ray vision at its highest intensity. In later stories, this ability is simply called "heat vision". Superman can hear sounds that are too faint for a human to hear, and at frequencies outside the human hearing range. This ability is introduced in "Action Comics" #11 (1939). "Action Comics" #1 (1938) explained that Superman's strength was common to all Kryptonians because they
For Tomorrow (comics) an alternate universe version of the character. The "real" General Zod appears for the "first" time in the "" arc, which ran in "Action Comics" in 2006. The idea of Superman moving to a Peru jungle to construct a new Fortress of Solitude is a major story arc elaborated on prior to the events of "Identity Crisis" and "Infinite Crisis". He does not return to the Arctic Circle to rebuild the destroyed Fortress until the "One Year Later" arc "". In addition, Equus returns in "Countdown to Final Crisis" #36 (2007), in which he is trying to instigate a strike