They spy and plot a way to intercept the shipment. For Sven's part, he's going to stow away on the ship disguised as a robeast. They also tip off the Voltron Force on Arus as to what they're up to.
Sven stows aboard, does some sluething and sabotaging, and just barely escapes as the ship explodes - but not before changing his disguise to that of a Doomite soldier. At this point, the Voltron Force launches and heads toward the satellite. Lotor sends out his own spider-type robeast to intercept Voltron. Unfortunately for Doomie kind, the robeast and Nuklon are annihilated.
Meanwhile, Romelle is concerned about the fate of Sven, and while she ponders that, he returns and sneaks up on her. A playful scene ensues - a great ep for Sven/Romelle shippers!