Horror devastates the DC Universe, and in this volume, Harley Quinn, Poison ivy, Punchline, and Zatanna all respond to the nightmare world of Knight Terrors in their own unique way!In Knight Terrors, DC’s heroes are taken past the land of the living, beyond the land of the dead, and directly to a new villain called Insomnia...who uses his powers to engulf every single hero and villain in their own dark and twisted nightmares. In this companion collection, see how Insomnia’s Nightmare Wave affects four of DC’s most popular characters: Harley Quinn, Poison Ivy, Punchline, and Zatanna! Enter the Harley Quinn Zone as Harley is confronted by the surreal and unsettling consequences of her choices! It’s a suburban nightmare as Poison Ivy wakes up in the life that she never wanted! Punchline confronts her long-suppressed fears in true horror-movie fashion! And Zatanna teams with Robotman of the Doom Patrol to defend the world from Insomnia’s Sleepless Knights!This volume collects Knight Terrors: Harley Quinn #1-2, Knight Terrors: Poison Ivy #1-2, Knight Terrors: Punchline #1-2, and Knight Terrors: Zatanna #1-2.