| Robert Shayne | ... | Prof. Clifford Groves (as Robert Shane) | |
| Joyce Terry | ... | Jan Groves (as Joy Terry) | |
| Richard Crane | ... | Dr. Ross Harkness | |
| Doris Merrick | ... | Ruth Marshall | |
| Beverly Garland | ... | Nola Mason, waitress | |
| Robert Long | ... | George Oakes | |
| Tandra Quinn | ... | Celia, the housekeeper (as Jeanette Quinn) | |
| Lee Morgan | ... | Charlie Webb | |
| Eric Colmar | ... | Buck Hastings | |
| Dick Rich | ... | Sheriff Andy Andrews | |
| Robert Easton | ... | Danny, a townsman | |
| Frank Gerstle | ... | Mr. Wheeler, the hunter | |
| Anthony Jochim | ... | Skeptical Naturalist | |
| Marshall Bradford | ... | Conference Chairman | |
| William Fawcett | ... | Dr. Fairchild | |
| Tom Monroe | ... | Stocky Townsman | |
| rest of cast listed alphabetically: | |||
| Robert Bray | ... | Tim Newcomb, the Cattle Rancher (uncredited) | |
| Crane Whitley | ... | State Police Chief (uncredited) | |
Directed by | |||
| Ewald André Dupont | (as E.A. Dupont) | ||
Writing credits | ||
| Aubrey Wisberg | (writer) and | |
| Jack Pollexfen | (writer) | |
Produced by | |||
| Ilse Lahn | .... | associate producer | |
| Jack Pollexfen | .... | producer | |
| Aubrey Wisberg | .... | producer | |
Original Music by | |||
| Albert Glasser | |||
Cinematography by | |||
| Stanley Cortez | |||
Film Editing by | |||
| Fred R. Feitshans Jr. | |||
Art Direction by | |||
| Walter Koestler | |||
Set Decoration by | |||
| Ben Bone | |||
Makeup Department | |||
| Harry Thomas | .... | makeup artist | |
Production Management | |||
| Clarence Eurist | .... | production supervisor | |
Art Department | |||
| Tommy O'Brien | .... | property master | |
Sound Department | |||
| Robert Roderick | .... | sound mixer | |
Special Effects by | |||
| David Commons | .... | special effects | |
| Jack Rabin | .... | special effects | |
Costume and Wardrobe Department | |||
| Jack Masters | .... | wardrobe master | |
Other crew | |||
| Mitzi Lerner | .... | production assistant | |
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| Freeway | Invasion of the Saucer Men | Mortuary | Alien Trespass | Bullitt |
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| Full cast and crew | Company credits | External reviews |
| IMDb Horror section | IMDb USA section |
An ultra-cheesy '50s monster flick in which we get to see Robert Shayne (Inspector Henderson from TV's 'Adventures of Superman') shamelessly recite hilarious dialogue and feverishly overact as a dedicated mad scientist who's found a way to reverse the evolutionary process! It's the treat of the film to watch him rant and rave about his idiotic theories without applying the brakes. First he turns a common house cat into a fierce saber-toothed tiger utilizing close-ups of a fake model; later, he jabs himself with a serum that transforms him into the title character. You've got to get a load of this ape-man's face; it's one of the most ridiculous-looking of all film monsters, like an over-the-head mask you'd buy in a Halloween shop, and it's completely expressionless with a muzzle and set eyes that don't move. For his creature, the filmmaker should have chosen to stay with the crude third or fourth stage appliances during the chintzy transformation sequence.
A real hoot, and a good deal of fun if you go for these types of movies. We also get to see a young Beverly Garland in the cast, although a double is used in a sequence where she dons a bathing suit and models for a photographer.