Dr. Ulmer
Demonstrating that a little knowledge is a dangerous thing, a convicted strangler studies the paranormal and finds a way to render himself invisible. Once he escapes, he sets out to find and eliminate five women who remind him of the mother he murdered. A police lieutenant (Robert Foxworth) sets out to safeguard them and bring the invisible killer to justice.
Ramsey
Foxy Lady Cocoa is out to take down her mobster boyfriend.
B.J. Murdock
After serving a prison term, a flamboyant attorney becomes a private eye with a staff of ex-cons.
Police Chief Peters
On his motorcycle Stein, a half-blood Indian, tries to stay out of the hands of the police, who are chasing him for accidentally killing a cop. Together with his friend Alan and a beautiful but desperate girl Stein will get involved in a robbery and more death. The police intensify the search, but the three won't give up that easily.
Dr. Joshua Randall
Dr. Peter Carey is a pathologist at a Boston hospital. The daughter of the hospital's Chief of Staff dies after an illegal abortion goes wrong, and Carey's friend and colleague Dr. David Tao is accused of performing the abortion. Carey doesn't buy it, and so he digs deeper, angering the girl's father in the process. Questions abound: Who performed the abortion? Was the girl really pregnant? And what does it have to do with stolen morphine, blackmail attempts, and a mysterious and dangerous masseur?
Ross J. Carmady
A private eye is hired to follow a mobster's former mistress.
Dr. Lucas Darrow
An ESP expert uses his powers to try to track down a psychic who uses telepathy to commit murder.
News Commentator
Boston is being terrorized by a series of seemingly random murders of women. Based on the true story, the film follows the investigators path through several leads before introducing the Strangler as a character. It is seen almost exclusively from the point of view of the investigators who have very few clues to build a case upon.
Radio Announcer (uncredited)
Boxer Joe Pendleton, flying to his next fight, crashes...because a Heavenly Messenger, new on the job, snatched Joe's spirit prematurely from his body. Before the matter can be rectified, Joe's body is cremated; so the celestial Mr. Jordan grants him the use of the body of wealthy Bruce Farnsworth, who's just been murdered by his wife. Joe tries to remake Farnsworth's unworthy life in his own clean-cut image, but then falls in love; and what about that murderous wife?
