Prisoners of the Lost Universe (1983) (repost)

Three people are transported into a parallel reality, where they find they must use modern technology, but medieval weapons, in order to save the citizenry from a murderous warlord.

Director:

 Terry Marcel

Writers:

 Terry Marcel (original story and screenplay), Harry Robertson (original story and screenplay)

Stars:

 Richard Hatch, Kay Lenz, John Saxon - via IMDB 

https://archive.org/details/PrisonersOfTheLostUniverse1983