Universe

People aboard a massive spaceship have no concept of life beyond their vessel. Originally presented as the series finale and airing on December 24, 1950, this episode's script was later adapted for "Dimension X" on August 2, 1951, and "X Minus One" on May 15, 1955, before being rebroadcast on "Monitor" in April 1975.

goldin_radiogoldindex.

The passengers aboard a massive spacecraft traveling through space have no idea they're actually living on a vessel.

"The ship is all" to a group of interstellar travelers.

People on a generation ship don't realize they're on a ship.