Dark Crisis on Infinite Earths (Dark Crisis) #4

Synopsis

Hal Jordan finds himself on an Earth formed in John Stewart's image, where he is perceived as a threat by 3 Green Lanterns from that world. Hal is rescued by Barry Allen, who takes him to another Earth to get help. At the Hall of Justice, a group led by Mister Terrific tries to determine the influence the Great Darkness is having on the Multiverse, while JSA members team up with other heroes to perform rescues around the world. Black Adam recruits the Legion of Doom to join him, but they soon come under attack by Deathstroke's army.