The Valley of Gwangi Subtitled VHS Video Special Effects Monster In the 1900s, a dinosaur from 50 million years ago was discovered in a hidden valley in Mexico, known as the Forbidden Valley. The dinosaur, Gwangi, is captured and eventually put on display in a circus... Ray Harryhausen, based on the original plan left by his mentor Willis H. O'Brien ("King Kong"), created this monster Western with his close friend C.H. Schneer. The Valley of Gwangi is an American film produced in 1969. Director: James O'Connolly Screenplay: William Bast Produced by: Charles H. Schneer Ray Harryhausen Starring: James Franciscus Gila Golan Richard Carlson Music: Jerome Moross Cinematography: Erwin Hillier Edited by: Henry Richardson Release: United States: September 3, 1969 Japan: July 19, 1969 Running time: 96 minutes