Couple of years after the events of"Change Your Mind", Steven (now 16 years old) and his friends are all set to enjoy the remainder of the lives peacefully. However, that all changes when a brand new black Gem arrives, outfitted with a drill that saps the life force of all living things on Earth. Within their most significant challenge in history, the Crystal Gems must work together to conserve all organic life on Earth within 48 hours.