World Without End

Writer/director Edward Bernds first sought Sterling Hayden and then Frank Lovejoy for the lead. Producer Richard V. Heermance eventually hired Hugh Marlowe, who asked for only a quarter of the other actors' salaries. According to Bernds, Marlowe was often lazy and unprepared.

The spacecraft crew are seen reclining to compensate for the high acceleration when they leave Mars orbit. This is scientifically valid and widely implemented in real-world spacecraft, but the crew would need to lie perpendicular to the acceleration forces, i.e. the cabin would have to be accelerating upwards relative to the camera position. Shots of the men leaving the crashed spacecraft reveal that the cabin was oriented upright and must have been accelerating forwards, so the acceleration should have slid the men out of their seats backwards towards the camera.