The second season of the American television series The Flash, which is based on the DC Comics character Barry Allen / Flash, sees Barry recognized as a hero in Central City after saving the city, only to face a new threat from a parallel universe in the form of the speedster Zoom, who seeks to eliminate everyone connected to the Speed Force throughout the multiverse. It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of Arrow. The season was produced by Berlanti Productions, Warner Bros. Television, and DC Entertainment, with Andrew Kreisberg, Gabrielle Stanton, Aaron Helbing, and Todd Helbing serving as showrunners.

Star City is a fictional city that appears in American comic books published by DC Comics, best known as the traditional home of the superheroes known by, or affiliated with, the shared alias of Green Arrow. Beyond that, it is also known to other characters of the DC Universe as both a port city and a haven for artists in many of the media, from print to audio/visual to music. Green Arrow's base of operation was initially New York City. However, during the Silver Age, Green Arrow's home was established as being in Star City, first appearing in Adventure Comics #266.