Knight Terrors: Superman (2023) #2

Plot

SUPERMAN AND SUPERGIRL TEAM UP IN THE NIGHTMARE REALM! In the terrifying Nightmare Realm, Superman and Supergirl search for answers and the rest of their family, but Superman is pulled into a haunted part of Metropolis's past, where he learns more about Marilyn Moonlight! In the waking world, an unlikely DC superhero family works to save the world from the Sleepless Knights.