Thirteen-year-old Jack Sullivan continues to navigate the monster apocalypse alongside his genius best friend, Quint; reformed middle school bully, Dirk; lone wolf survivor, June Del Toro; and Jack's loyal pet monster, Rover. Jack, June, Quint, and Dirk create a new community with the monsters of Joe₂s Pizza the best home Jack has ever known. But when the kids discover a radio transmitter broadcasting a signal from other survivors, Jack fears that his friends will soon contact their parents and leave him behind. To make matters worse, a wounded wretch is possessed by Rezzoch, the destructor of worlds, and it attempts to infiltrate Jack₂s mind, enlisting him to help Rezzoch fully cross over into our world. Just before the final broadcast, Jack's friends must abandon the radio to enter a nightmare dreamscape in Jack's mind where they must work together to save him before time runs out.