I'm looking for a 50s-60s sci-fi movie involving a man stranded on a planet that meets a runaway slave with a pouch filled with pills that allow you to tolerate the atmosphere. The slave also had a band (maybe on their neck or wrist?) that the slave owner could activate pain. I’m not sure they are able to remove the band, but the slave owners try and track them that way. The two of them hide from spaceships searching for the runaway slave. It may have been on Venus. The slave wears a Roman type skirt and is dark haired.
Other than the slave owner complex, the movie was mostly about the 2 characters interacting and learning from each other. It was so long ago, I hope this is accurate info.