The peace is short-lived as Yurak's fleet attacks once again. The combined forces of Voltron and the new castle's defenses easily send Yurak on his way, so it's back to celebrating for the team. Zarkon wants Yurak to pay with the defeat with his life; she and a creature go to Arus.
Meanwhile, the Princess and the Voltron Force are out in the country once again trying to coax the Arusian people to come partake in the feast. Haggar is lurking nearby and the team realizes this when they spot her Blue Cat. The team splits up to look for her, and when Lance comes upon her she snares him in a magical net. Luckily, Sven intervenes before she can harm Lance. Sven insists that Lance go for help while he takes on Haggar alone. Unfortunately, Haggar fights dirty and the beast that made the journey with her strikes Sven, nearly kill him. Lance and Keith come upon their injured friend shortly thereafter.
Satisfied, Haggar believes all that she needs to do now is energize the beast into a Robeast and, with the team unable to form Voltron without Sven, she's sure they're finished this time. The remaining team gets in their Lions and tries to fight off the Robeast. This time, they don't need Voltron as Lance was able to push the Robeast off a cliff and into molten lava. His Lion could withstand the heat because lava is its natural habitat; it ends with everyone celebrating again, but with concern about Sven hanging over them.