When cutsie time is over, the team gets back to the business of figuring out what the heck Haggar is up to by launching the Lions. A short time later, the ground parts and the team knows something is amiss so Voltorn is formed.
A robeast that was down in the ground where the crack formed, manages to wrap chains around all of Voltron's limbs hence trapping him in the cravasse. Then it sends out two tentacles that have metal chewing blades on the ends...and tries to saw Voltron in half. The mice, in their new ship, try to come to the rescue but things go awry and Cheesy is left hanging precariously from the crevice's edge. Voltron now can't break free with force without risking Cheesy's life. Fortunately, the other mice use their new plane to rescue Cheesy so Voltron can get to work.
Once free, Voltron makes short work of the robeast and Haggar once again has to explain to Zarkon how exactly she was thwarted by a bunch of mice.