In the Steven Universe episode (Season 4, Episode 20), Steven embarks on a quest to find his "magical destiny," only to discover that his mother, Rose Quartz, simply wanted him to be a human boy. The title refers to a second tape Steven finds in the desert, intended for a daughter named Nora —an "alternate ending" to the video Rose left for him. Plot Breakdown
Distraught by the idea that he might have a sister or a "missing" destiny, Steven confronts Greg. Greg explains that they didn't know the baby's gender, so they made two tapes and chose two names. [S4E20] Lion 4: Alternate Ending
Lion coughs up a mysterious pink key. After it fails to open the chest in Lion's mane, Lion takes Steven to several of Rose's secret locations before arriving at a structure in the desert. In the Steven Universe episode (Season 4, Episode