Lost in Space - Season 2 Episode 8 The Deadly Games of Gamma 6 A space colony family struggles to survive when their ship is hopelessly thrown off course.
Overview: When a troope of Galactic Gladiators arrive on the planet, they challenge Professor Robinson to a duel, which will be aired all of the galaxy. John declines saying he isn't interested in physical combat. Dr Smith takes up the offer when he makes a deal that if he wins, he will be returned to Earth. Unbeknownst to him, if he loses, which is a near-certanty, Earth will be destroyed.