While making repairs to the castle, the Paladins encounter unusual spongy spores that lead them to a planet of brilliant engineers- the Olkari. When landing, Team Voltron meet the Olkari people in the forest, where they adapted from machine to nature based technologies. When rescuing the Olkarian king Lubos, Team Voltron find he willingly sold out his people as slaves to live in comfort, as he builds a super-weapon for Zarkon’s forces. As Voltron engages the super-weapon, it learns and adapts to their attacks, even replicating them. After Pidge has help from the Olkari, she reconnects to her Green Lion in a way that allows her to summon a new weapon, which when the Black Cubes attempt to clone, instead grow massive plant roots. When leaving Olkarian space, the Castle of Lions is intercepted by a Galra war fleet.