A shipwrecked crew finds evidence of a long-dead space-traveling civilization. Based on a story by Murray Leinster, this episode of Dimension X originally aired on May 20, 1950.

Featuring "adventures in time and space told in future tense", Dimension X aired over NBC from Apr. 8, 1950, through Sept. 29, 1951. The series adapted stories by the modern masters of science fiction, including Isaac Asimov, Ray Bradbury, Robert Heinlein, Clifford Simak, Theodore Sturgeon, and many others.