Dimension X: Courtesy (Dramatized‪)‬

An expedition to Landro encounters a deadly plague, and the serum they need is in the hands of the planet's inhabitants. Based on a story by Clifford Simak, this episode of Dimension X originally aired on July 26, 1951.
Featuring "adventures in time and space told in future tense", Dimension X aired over NBC from April 8, 1950, through September 29, 1951. The series adapted stories by the modern masters of science fiction, including Ray Bradbury, Robert Heinlein, Clifford Simak, Theodore Sturgeon, and many others.