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

The castle is attacked by an alien battle cruiser and the new Paladins must form Voltron.

When the Paladins start to lose focus, Princess Allura puts them through training; with cooperation, the Paladins can learn how to form Voltron.

Shiro is forced to draw from painful memories from his past when a massive, evil robot becomes a threat.

As a Paladin threatens to leave the team, invaders get inside the castle and destroy its power crystal in hopes of stealing Voltron.

Hunk and Coran go after a new crystal while the rest of the team tries to stop Sendak from leaving the castle with Voltron.