Great stop motion effects in a mediocre film...
“The Valley of Gwangi,&#34; released in 1969, is a fantasy film featuring the stop motion animation work of Ray Harryhausen (“Clash of the Titans,” “The Beast From 20,000 Fathoms”). At the turn of the 20th century, members of a struggling Wild West show traveling through rural Mexico come upon Forbidden Valley, a lost world containing survivors from the age of dinosaurs. There they capture a 14-foot carnivorous allosaurus in hopes of making it their show’s star attraction. In a page from the “King Kong” playbook, the dinosaur breaks free of its bonds and goes on a destructive rampage.<br /><br />Though the film itself is just so-so, it has some terrific sequences.The scene in which four cowboys lasso the dinosaur, named Gwangi (but never explained why), ranks with the best of Harryhausen. There’s also a neat scene in which Gwangi is confronted in a town square. Unfortunately, it takes nearly 45 minutes to get to the “good stuff” — Harryhausen’s sequences. The film’s build-up is sluggish and the acting wooden. James Franciscus is a dull leading man, Gila Golan is the token love interest, and sci-fi regular Richard Carlson is along for the ride.<br /><br />The plot also involves gypsies and a curse, but are really marking time fillers until the dinosaur is revealed. The second half is much better and much more entertaining, thanks to Harryhausen’s artistry. The problem with this picture and so many of Harryhausen’s other movies, is that his creations are infinitely better than the stories in which they appear. Clearly, most of the production budget went to the animation rather than the human talent. If there were a stronger script, more scenes with the dinosaurs and less extraneous exposition, “The Valley of Gwangi” would be much improved.<br /><br />Bonus extras on the widescreen Blu-ray release include the featurette “Return to the Valley,” in which an 83-year-old Ray Harryhausen discusses the movie’s conception and development, and a theatrical trailer.
The movie title "The Valley of Gwangi," available on Movies & TV, has received an average rating of 4.5 from 1322 reviewers. 
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The additional details include the following in key-value format :
 {"Is Discontinued By Manufacturer": "No", "Product Dimensions": "7.5 x 5.5 x 0.5 inches; 3.5 Ounces", "Director": "James O'Connolly", "Media Format": "Blu-ray", "Run time": "1 hour and 35 minutes", "Release date": "March 14, 2017", "Actors": "James Franciscus; Gila Golan; Richard Carlson; Laurence Naismith", "Studio": "Warner Archive Collection", "Country of Origin": "USA", "Number of discs": "1"}

Here is a brief synopsis of the title : Cowpokes head into a mysterious Mexican valley to head ’em up and move ’em out. But they’re not looking for little doggies. They’re looking for great big dinosaurs. James Franciscus stars in this thunderous adventure featuring amazing special effects by Ray Harryhausen [The Beast from 20,000 Fathoms, Clash of the Titans (1981)]. Franciscus plays a Wild West showman who leads his riding and roping crew into the title region, where prehistoric giants still roam. Thanks to Harryhausen wizardry, fantastic creatures lunge, fight and rampage in scene after dazzling scene (including an awesome sequence where the cowboys rope Gwangi, a razor-toothed allosaurus). Saddle up and join the excitement..