Lost in Space Season 3 Episode 4 Hunter's Moon

The Jupiter 2 must find a landing spot so John and Don can repair her engines. Scouting an inhospitable world, the space pod encounters a force field and must land. Outside, a monster attacks, and John destroys it. Unfortunately, it was the quarry of Megazor, who must prove his skills before assuming the throne of the Zon civilization. As punishment, Megazor makes John battle an invisible alien, and when John wins, Megazor's computer rates him at just enough points to secure the throne for Zon. Now John is the prey, equipped with a defective survival suit, while Megazor the hunter carries the dangerous Zon Destructo-blade!