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 Joe's 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 Jack's 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.