The Psychotronic Film Society unearths another insanely rare slice of world cinema at The Sentient Bean. This time, it’s the “lost” 1974 British action spoof “The Swordsman” aka “Zapper’s Blade of Vengeance.”

One of the most unashamedly campy films from that swinging time period you’re ever likely to see, this low-budget independent production was directed by the late Lindsey Shonteff (“Devil Doll,” “The Man from S.E.X.”), and has never been released on DVD anywhere in the world. Rumor has it the original negatives were destroyed decades ago, and all that survives is a long-unavailable VHS tape from Denmark. That VHS tape (with Danish subtitles, of course) is the source the PFS will employ for this screening.

The plot? A sexy female private eye (Linda Marlowe) is hired to investigate the mysterious death of an heir to a massive fortune in the South of France. She’s aided by her small Asian sidekick, who insists on dressing and talking like Humphrey Bogart in “Casablanca.” Seriously.

It’s a tongue-in-cheek parody of detective and action films that’s filled with ridiculous dialogue and tons of flashy sword fights — a cult film that simply hasn’t found its own cult yet. Now’s your chance to get in on the ground floor and say you saw it here first! Showtime is 8 p.m., with $7 admission.