"A Feasibility Study" is an episode of the original The Outer Limits television show.
It was remade in 1997 as part of the revived The Outer Limits series with a minor title change: "Feasibility Study".
Eventually, a suburbanite is introduced to the hideous Luminoid rulers, who reveal their plans and that the punishment for disobedience is to be touched by a Luminoid and thereby contract their terrible disease.
All that's left is defiance and protecting the rest of humanity back on Earth.
In the final scene, they willfully contract the disease from each other, thus choosing death over slavery, and rendering the Luminoids' experiment inconclusive.