The Bronze Age Mort Weisinger retired from DC in 1970 and his final issue of Action Comics was issue #392 (September 1970). Murray Boltinoff became the title's editor until issue #418. Metamorpho was the backup feature in issues #413–418 after which the character had a brief run as the backup in World's Finest Comics. Julius Schwartz became the editor of the series with issue #419 (December 1972) which also introduced the Human Target by Len Wein and Carmine Infantino in the backup feature.McAvennie "1970s" in Dolan, p. 153: "Starting as a back-up feature in the pages of Action Comics, scribe Len Wein and artist Carmine Infantino introduced Christopher Chance, a master of disguise who would turn himself into a human target—provided you could meet his price." The Green Arrow and the Black Canary became a backup feature in #421 and ran through #458, initially rotating with the Human Target and the Atom. Between issues #423 (April 1973) and #424 (June 1973), the series jumped ahead by one month due to DC's decision to change the cover dates of its publishing line.
The Bronze Age Mort Weisinger retired from DC in 1970 and his final issue of Action Comics was issue #392 (September 1970). Murray Boltinoff became the title's editor until issue #418. Metamorpho was the backup feature in issues #413–418 after which the character had a brief run as the backup in World's Finest Comics. Julius Schwartz became the editor of the series with issue #419 (December 1972) which also int.roduced the Human Target by Len Wein and Carmine Infantino in the backup feature.McAvennie "1970s" in Dolan, p. 153: "Starting as a back-up feature in the pages of Action Comics, scribe Len Wein and artist Carmine Infantino introduced Christopher Chance, a master of disguise who would turn himself into a human target—provided you could meet his price." The Green Arrow and the Black Canary became a backup feature in #421 and ran through #458, initially rotating with the Human Target and the Atom Between issues #423 (April 1973) and #424 (June 1973), the series jumped ahead by one month due to DC's decision to change the cover dates of its publishing line.