"Trinity War" is an 11-issue comic book story arc first published in 2013 by DC Comics, featuring the fictional superhero teams the Justice League, Justice League of America, and Justice League Dark. The arc spans several titles, including Justice League, Justice League of America, Justice League Dark, Constantine, Trinity of Sin: Pandora and Trinity of Sin: The Phantom Stranger. The story is an action-mystery that sees the Justice League, Justice League of America, and Justice League Dark clash, in order to solve the mystery of Pandora's Box. The event also introduces the Crime Syndicate and the reveal of Earth-3 to The New 52.

Justice League Dark, or JLD, is a superhero team appearing in American comic books published by DC Comics. The team made their debut in Justice League Dark #1. The team features some of the more supernatural characters in the DC Universe, handling mystical threats and situations deemed outside the scope of the traditional Justice League. Similarly to the Justice League title, the team features well-known characters such as John Constantine, Zatanna, Doctor Fate, and Wonder Woman while also bringing exposure to lesser-known supernatural characters. The team has starred in an eponymous animated film and in Justice League Dark: Apokolips War.