I Was a Zombie for the F.B.I.

I Was a Zombie for the F.B.I. is a 1982 American scifi/horror movie directed by Marius Penczner about two agents from the Federal Bureau of Investigation who try to prevent an alien takeover of Earth. A low-budget production, it was filmed in black-and-white and featured a largely amateur cast of students from Memphis State University.

Plot
After landing by Pleasantville, United States, the aliens convince two Earth criminals to help them rule the world. The aliens hypnotize people into a "zomboid state" and unleash a reptilian creature. Two F.B.I. agents fight against the aliens, criminals, and the creature to combat the threat of imminent world domination