Steven Universe: Bluebird Season 6, Ep 5
Someone is playing pranks on Steven, someone that turns out to be a new gem, Bluebird, who is obviously a fusion of old nemeses Aquamarine and Eyeball the Ruby. Her dastardly plan can be stopped, but only at terrible cost....
Steven Universe: The Question Season 5, Ep 21
Ruby spends some time with Steven, Greg and Amethyst, ridin' the range an havin' cowboy adventures. She returns with something important to tell Sapphire.
Steven Universe: Drop Beat Dad Season 3, Ep 7
Steven, Greg and Sour Cream are met by a figure from the past.