I believe I first became aware of this sci-fi/sexploitationer via the biography for actress Valerie Leon included among the extras on the Anchor Bay DVD of Hammer's superior BLOOD FROM THE MUMMY'S TOMB (1971); incidentally, the film under review was made by rival company Tigon.
To begin with, the script was apparently inspired by a comic strip (such cinematic adaptations were all the rage at the time no doubt, the makers were encouraged by the success of BARBARELLA [1968]). Still, even reading through the cast list, I knew not to raise my 'artistic' hopes too highly given that it featured both James Robertson-Justice and Charles Hawtrey, stalwarts of (respectively) the popular "Doctor" and "Carry On" comedy franchises
who actually turn out to be the villains of the piece!! The narrative drew heavily on another then-current fad i.e. espionage in fact, the hero is a stud-like albeit laid-back secret agent who naturally proves irresistible to the alien women (actually, an alternate moniker for the film) the titular figure (played by veteran Dawn Addams) sends his way in order to derail his investigation into the abduction of several earth girls.
That said, the plot is barely there and becomes especially confusing not to say silly during the latter stages; for what it's worth, the film culminates in a chase wherein the otherworldly gals kill virtually all of their male pursuers simply by pointing their fingers at them (accompanied by the incongruous noise of gunshots)!! Needless to say, ZETA ONE's raison d'etre and prime asset is its relentless parade of innumerable but anonymous starlets of the era in the nude or otherwise scantily-clad: the above-mentioned Valerie Leon herself is underused, but fellow future Hammer lead Yutte Stensgaard who engages the hero (to whom he's recounting his non-exploits) in a lengthy and decidedly irrelevant game of strip-poker comes off quite well (no pun intended). Also worth mentioning are the low-budget but appropriately psychedelic sets and the title tune (featuring a reasonably effective guitar riff).
