Time of the Robots was made using films in the public domain. Many of them were serials. Here is a complete list of those films.
Rocketship
Flash Gordon Conquors the Universe
Tarzan the Fearless
The Phantom Creeps
The Love Flower
Undersea Kingdom
Radar Men from the Moon
The Return of Chandu
The Lost World (1925)
The Penalty
White Zombie
Frankenstein (1910)
Les Vampires
The Patchwork Girl of Oz
Maciste in Hell
