Action Comics character included X-ray vision in issue #18 (November 1939) and telescopic vision and super-breath in issue #20 (January 1940). Luthor, a villain who would later become Superman's archenemy, was introduced in issue #23 (April 1940). The original Toyman was created by writer Don Cameron and artist Ed Dobrotka in issue #64 (September 1943). By 1942, artist Wayne Boring, who had previously been one of Shuster's assistants, had become a major artist on Superman. Under editor Mort Weisinger, the "Action Comics" title saw a further expansion of the Superman mythology. Writer Jerry Coleman and Wayne Boring created the Fortress of Solitude
Action Comics 1 copy for US$1.5 million, making it the most expensive and most valuable comic book of all time. The copy sold is the third highest-graded copy from the CGC, which stands at 8.5 VF+ grade. As of 2011, there were six known Comic Guaranty LLC (CGC)-graded copies with a grade above VG (CGC 4.0), with only one issue having the grade of VF/NM (CGC 9.0) at that time. EC and "Mad" publisher William Gaines, whose father was also a comic book publisher and had business dealings with DC Comics at the time "Action Comics" #1 was published, claimed in a "Comics