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Steven befriends a magical mirror that can mysteriously communicate with him, and ends up freeing its trapped captive: Lapis Lazuli, another mysterious Gem.
Steven tells Connie about his mission with the Gems to heal Amethyst when she cracked her gem.
Lapis Lazuli disappears after reigniting a past conflict with the three Crystal Gems and takes the ocean 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 right.