The Valley of Gwangi is a 1969 American western-fantasy film directed by Jim O'Connolly and written by William Bast. It stars James Franciscus and, in their final film appearances, Richard Carlson and Gila Golan. It was filmed with creature effects provided by Ray Harryhausen, the last dinosaur-themed film he animated. Harryhausen had inherited the project from his mentor Willis O'Brien, responsible for the special effects in the original version of King Kong (1933). O'Brien had planned to make The Valley of Gwangi decades earlier but died in 1962, before the project could be realized.