Adventures of Superman: The Mysterious Cube

"The Mysterious Cube" is the fourth episode of season six of the live-action superhero/action series The Adventures of Superman and the 95th episode of the series overall. It was directed by George Blair with a script written by Robert Leslie Bellem and Whitney Ellsworth. It first aired in syndication on February 24th, 1958. In this episode, Superman helps out Inspector Henderson by going after wanted fugitive Paul Barton, who has secured himself inside a seemingly impregnable cube. Superman must find a way inside before the seven-year mark passes in which case Barton would be declared legally deceased.