The series is inspired by Reed Tucker's book Slugfest: Inside the Epic, 50-year Battle Between Marvel and DC.
The competition between the publishers actually dates back to the FDR years and the publication of Action Comics No. 1 (which introduced Superman and launched DC) and Marvel Comics No. 1 (which introduced Namor the Sub-Mariner), but it was the revolutionary 1960s relaunch of Marvel by Stan Lee, Jack Kirby and Steve Ditko that gave the rivalry an urgency that transformed the marketplace.