The powers of DC Comics character Superman have changed since his introduction in the 1930s. The extent of his powers peaked during the 1970s and 1980s to the point where various writers found it difficult to create suitable challenges for the character. As a result his powers were significantly reduced when his story was rebooted by writer John Byrne after the Crisis on Infinite Earths series. After Byrne's departure, Superman's powers were gradually increased again, although he still remains weaker than his pre-Crisis incarnation.