The plot concerns the black-clad Legion of the Winged Serpent, a rogue group of human-like telepathic aliens led by Captain Rameses.

Opposing any attempt to interfere with less-developed planets is the Intergalactic League of Races, a highly advanced group of bald, big-headed aliens from Zeta Reticuli.

Rameses lands at the base pretending to be a friendly researcher, and the League reminds him that under the Galactic Treaty he is to have no contact with humans.

While taking a tour of the base he is disturbed to see a television broadcast featuring human UFO expert and astronomer Professor Allan Duncan discussing Rameses' abductions.

The United States armed forces discover it in orbit, but are powerless to prevent the ensuing suicide epidemic.

[1] Many elements of the film, including the design of the robots and the winged serpent emblem the black-clad villains wear, are taken from UFO accounts.

[4] John Duvoli of The Evening News called it a "poor imitation" of previous science fiction films.

[9] Janet Maslin of The New York Times wrote that the film is too low budget and derivative to even appeal to science fiction fans.

[10] Variety described the film as a "cinematic curio", stating that it was a "1970s replica of those hoaky old Republic sci-fi pix of the 1940s, apparently made in complete sincerity by young director Ed Hunt with none of the phony campiness that often haunts such recreations.