When an ancient Diamond Authority artifact accidentally gets activated, Steven, Sadie, and the Crystal Gems must work together to deactivate the Harmony Core before it destroys earth.

Steven and the Crystal Gems embark on an epic musical journey after the Harmony Core, an ancient Diamond Authority artifact, accidentally activates on Earth, capturing the people of Beach City. As Steven becomes responsible for bubbling each Harmony Core, he'll learn that the only way to stop it is through the power of song.

Join musician and writer S.M. Vidaurri (Adventure Time(TM), Jim Henson's The Storyteller) and artist Mollie Rose (Weeds) as Steven and the Crystal Gems put on the show of their lives to save everyone in Beach City and the entire Earth