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
Superman "The Adventures of Superman", which ran from 1940 to 1951 for 2,088 episodes, most of which were aimed at children. The episodes were initially 15 minutes long, but after 1949 they were lengthened to 30 minutes. Most episodes were done live. Bud Collyer was the voice actor for Superman in most episodes. The show was produced by Robert Maxwell and Allen Ducovny, who were employees of Superman, Inc. and Detective Comics, Inc. respectively. Paramount Pictures released a series of Superman theatrical animated shorts between 1941 and 1943. Seventeen episodes in total were made, each 8–10 minutes long. The first nine