"Voyage to the Planet of the Prehistoric Women" (1968) is the second of two reworkings of "Planeta Bur," a Soviet sci-fi film from 1959. The first was the similarly titled, "Voyage to the Prehistoric Planet" (1962) assembled by director Curtis Harrington for producer Roger Corman. "Voyage to the Planet of the Prehistoric Women" was confabulated by Peter Bogdanovich using the pseudonym, Derek Thomas. Working under the dictum that American International would buy "Planet" if it had some women in it, he inserted new footage featuring Mamie Van Doren, a bevy of nubile cuties in white hot pants, an
You can stream Voyage To The Planet Of Prehistoric Women free and legally on OldReel, via the Internet Archive.
Yes — it is in the public domain and can be watched and shared freely.