A space explorer, previously thought lost in space, returns to Earth and joins four teenagers in a search for a giant alien robot lion

The Blue Lion delivers the team to an alien planet where they discover a mysterious castle. Inside, they awaken an alien princess who sends them on a mission to find the remaining lions.

The Castle is attacked by an alien battle cruiser. The new Paladins must form Voltron for the first time in 10,000 years.

When a Galra Commander infiltrates the castle and destroys its power crystal, the team must protect Voltron from falling into the wrong hands.