Journey into Mystery was an American comic book series published by Atlas Comics, and later its successor Marvel Comics. It featured horror, monster, and science fiction stories. With the start of the Silver Age of Comics, Marvel switched the feature to superhero stories and in issue #83 introduced Thor, inspired by the Norse thunder god and by writer Stan Lee's musings that comic books were the mythology of the modern day. Journey into Mystery primarily featured Thor stories through issue #125 and Journey into Mystery Annual #1, at which point the series was retitled The Mighty Thor.