Il pianeta degli uomini spenti

Prof. Benson

Cmdr. Bob Cole

Dr. Fred Steele

Eve Barnett

Mrs. Collins

Barrington

Gen. Varreck (as Carlo d'Angelo)

Cathy Cole

Boyd

Pat (as Joseph Pollini)

Dr. Cornfield

United Commission Member

Lewis Boyd

(as Anna Maria Mustari)

United Commission Leader (uncredited)

When the astronauts walk on the surface of "The Outsider" in a location shot, they are seen from behind and none of them are wearing a blue helmet. When they are inside the cave, an obvious studio shot, the commander is seen wearing a vivid blue helmet. When they leave the cave and the story cuts back to the return trip back to the space ship, the blue helmet has again disappeared.

When Bob Cole says "this is the space zone to be scanned" after receiving the information on the planet from the Earth base, he gives the pilot the piece of paper with the information on it, but the pilot does not actually grab the paper, and it flutters to the ground. The pilot then leaves without picking it up or checking the information.

Professor Benson: Human feelings are inconsistent . In fact, they're the only inconsistent elements in all nature.

Dr. Fred Steele: George, those meteorites are messing up everything!

Mrs. Collins: [Reacting to the commotion in the observatory] What's happening, Reynolds?