This is the Steven Universe's seasons timeline from 2015 to 2021 after its end!.
2013–2015
Season 1
Focuses on Steven learning about his powers, everyday missions with the Crystal Gems, and discovering what it means to be a Gem.
Introduces the world, characters, and hints at the Gem War and Homeworld.
2015–2016
Season 2
Explores Gem history and politics more deeply.
Steven begins to understand Rose Quartz’s past, while new antagonists from Homeworld appear.
2016
Season 3
Centers on conflict with Homeworld, especially the Cluster and the Diamonds’ plans.
Themes of identity, loyalty, and sacrifice become stronger.
2016–2017
Season 4
Focuses on Steven’s emotional growth and his attempts to avoid violence.
Develops the Diamonds as characters and questions the nature of power and authority.
2017–2019
Season 5
Concludes the main story arc.
Steven confronts the truth about Rose Quartz, resolves the conflict with Homeworld, and promotes change through empathy rather than force.
2019–2020
Future season 1
Steven Universe Future (2019–2020) – 20 episodes
Focuses on Steven’s life after the main story and deals with his personal growth
2021
Steven Universe - The Movie
Focuses on Steven’s fear of change and regression after peace has been achieved.