Agent X-2: Operation Underwater

1966's "Terror Beneath the Sea" is a forgotten sci-fi from Japan, less surprising once you learn it's from neither Godzilla's Toho, or Gamera's Daiei. It's actually a Toei production, one of three that made it to American shores, with "Magic Serpent" and "The Green Slime" better remembered. Apart from future martial arts star Sonny Chiba, we have teenage blonde Peggy Neal, who went on to star in Shochiku's "The X from Outer Space," who promptly disappeared from the scene. The Gill Man costumes are initially intriguing, but become obvious through repetition, though the prospect of human beings being transformed into amphibian cyborgs manages to produce some effective moments. Director Hajime Sato really struck paydirt with his final film, 1968's "Goke Body Snatcher from Hell" (also from Shochiku), as nightmarish a combination of horror and sci-fi as any made in Japan. "Terror Beneath the Sea" aka "Water Cyborgs" was frequently seen on television through the late 70s (not much since), airing three times on Pittsburgh's Chiller Theater from 1974 to 1978.