Voltron, Defender of the Universe: Lion Force

Far from Planet Arus on the slave world of Moura, Zarkon is building a tremendous Ion Cannon. When complete, it will have enough power to destroy all of Planet Arus in a single shot! Keith and Lance sneak up to the cannon at night and plant explosives around it, in an attempt to sabotage the cannon. But Haran, a Mouran slave, turns on his potential rescuers and helps Lotor disable the explosives. The cannon is completed, and Haran himself is ready to pull the trigger on Planet Arus and Voltron!