Secret City Saga is a concept and collection of various comic book titles created by writer-artist Jack Kirby, and published by the short-lived Topps Comics, an offshoot of the popular Topps Trading Card company. Beginning in April 1993, the Secret City Saga books consisted of three four-issue miniseries (Jack Kirby's Secret City Saga, Satan's Six, TeenAgents) and three one-shot specials (Captain Glory, Nightglider, and Bombast), which were all preceded by the one-shot promotional giveaway, Jack Kirby's Secret City Saga #0.
The concept itself saw Topps lease Kirby's name alongside the characters, and saw the line referred to as "The Kirbyverse". All the characters resided in the same shared universe, and the deal also presented the final time that Kirby had complete creative control over any of the many properties that he had created in his career. It was initially seen as a creative and financial failure. The line consisted of leftover concepts Kirby had developed years prior, and generated low sales and minimal reader interest, finding a niche only with hard-core Kirby fans.
