Lost in Space (1965)

S1E23 The Space Trader

When a sudden storm devastates the Robinsons' food reserves, a trader shows up, looking to barter food in exchange for some of their equipment. Dr. Smith seizes the opportunity to trade the robot for supplies but secretly keeps the food for himself. Once the Robinsons learn about his betrayal, they negotiate to get the robot back, but it comes at a cost: Dr. Smith must offer himself in return. The trader then intends to take Smith away as a slave to another planet.