A detective agency is faced with a strange case: to find Martians already on Earth. Story by Donald Wolheim. This episode of Dimension X originally aired on June 3, 1950.
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.