Two years after bringing peace to the galaxy, Steven Universe sees his past come back to haunt him in the form of a deranged Gem who wants to destroy the Earth.

After saving the universe, Steven is still at it, tying up every loose end. As he runs out of other people's problems to solve, he'll finally have to face his own.

A young boy takes his mother's place in a group of gemstone-based beings, and must learn to control his powers.