Steven attempts to tame a monster's wild form when he accidentally releases it from its gem bubble.

Lapis Lazuli disappears after reigniting a past conflict with Garnet, Amethyst and Pearl, and takes the ocean along with her, leaving Beach City in a panic on the first day of summer. Steven, Connie, Greg, Lion and the Gems go on a mission to confront Lapis and set things back to normal.