
An architect is convinced there are aliens in the world.

Vincent warns a town about an alien (Joe Maross) incarcerated for murdering a doctor who tried to examine him.

Vincent pursues an alien (Gene Hackman) whose case contains spores that will produce mature aliens when opened.

A lovely alien (Suzanne Pleshette) seeks Vincent's help in controlling synthetic emotions implanted in her by alien scientists.

Vincent's friend Charlie Gilman (Don Gordon) discloses an ulterior motive for killing an alien during his trial for murder.