With Shiro compromised by Haggar's magic, Lotor has managed to win over Allura and convince the team to help him enact his vision for a new, peaceful universe.
After Lotor builds a series of ships that can connect into a robot capable of taking on Voltron, the paladins must use all their strength -- and Allura's ancient magic -- to stop him.
In an effort to locate where a rare form of quintessence came from, Keith and Krolia enter the Quantum Abyss where they battle new creatures, old memories, and time.
After learning the terrifying truth about Lotor's plan for a new "peaceful" empire, Allura rejects his pleas to join him and takes him head on in combat.
The paladins assemble Voltron to battle their foe-turned-friend-turned-foe again, Lotor, over the fate of a planet of lost Alteans, the Galra, and the rest of the universe.
Lotor considers next steps with the help of the paladins and Voltron as fractions of the Galra Empire prepare to battle him over his claim to the throne.