Wrestling legend Bull Montana plays a murderous gorilla with a human brain transplant who is tracked by a feisty newspaper reporter.
| Actor | Role |
|---|---|
 Noah BeeryDr. Ord | Dr. Ord |
 Pat O'MalleyKirk Connelly | Kirk Connelly |
 Agnes AyresHelen Allen | Helen Allen |
 J. Barney Sherry'Shut the Door' Gordon | 'Shut the Door' Gordon |
 Bull MontanaThe Gorilla | The Gorilla |
 Wesley BarryDinty | Dinty |
 Charles Hill MailesJ.L. Rich (as C. Mailles) | J.L. Rich (as C. Mailles) |
 Walter LongJim Hogan | Jim Hogan |
 Lydia Yeamans TitusLilly Doody | Lilly Doody |
| GGeorge DromgoldThomas Hickson | Thomas Hickson |
| EEdward CooperW.W. Crocker | W.W. Crocker |
 Charles WestSlim Hogan | Slim Hogan |