Julius Schwartz became the title's editor with issue #233 (January 1971) and together with writer Denny O'Neil and artist Curt Swan streamlined the Superman mythos, starting with the elimination of Kryptonite. Elliot S. Maggin began his long association with the title with the story "Must There Be a Superman?" in issue #247 (Jan. 1972). Writer Cary Bates, in collaboration with Swan, introduced such characters as the supervillain Terra-Man in issue #249 (March 1972) and the superhero Vartox in issue #281 (Nov. 1974). Issues #272 (Feb. 1974), #278 (Aug. 1974), and #284 (Feb. 1975) of the series were in the 100 Page Super Spectacular format. "Superman" #300 (June 1976) featured an out-of-continuity story by Bates and Maggin which imagined the infant Superman landing on Earth in 1976 and becoming a superhero in 2001. The tale was an inspiration for Mark Millar's "" limited series published in 2003. DC's parent company Warner Communications reinstated the byline for Jerry Siegel and Joe Shuster which had been dropped decades earlier and the first issue with the restored credit was "Superman" #301 (August 1976). Martin Pasko and Swan created the Master Jailer character in issue #331 (January 1979). The bottle city of Kandor, which had been introduced in 1958, was restored to normal size in a story by Len Wein and Swan in "Superman" #338 (August 1979).