Zombie Holocaust (1980)
He's a depraved, homicidal killer...and he makes house calls!
The story follows Dr. Peter Chandler and a reporter named Lori who discover a rash of cannibalism in New York. Soon the two have traced the cannibalistic activity to a remote island where they encounter a tribe of cannibals and a mad scientist who appears to be experimenting with reanimating dead corpses. The result of this work is four bloodthirsty zombies who roam the island and, along with the cannibals, wreak havoc on Lori and Dr. Peter's expedition.