The Valley of Gwangi

In 20th century Mexico, T.J. Breckenridge runs a rodeo to draw crowds. Her former lover, Tuck Kirby, arrives with plans to buy out the show. A young Mexican boy named Lope begins following Tuck, hoping to gain fame and fortune through the rodeo.

Tuck offers to purchase T.J.'s operation, signaling a potential change of control. T.J. is wary of his intentions and the old romance resurfaces as they clash over the future of the show.

Lope is drawn to the spectacle and seeks a place in the show, following Tuck as a path to fame. The pursuit shows the boy's ambition and the dangers of chasing fortune.

A bull attack threatens Lope, and Tuck intervenes to save him. Impressed by the bravery, T.J. reluctantly accepts Tuck back into the fold and into the show's plans.

T.J. guards a prized horse named El Diablo to boost attendance. Tuck meets Horace Bromley, a British paleontologist, who shows fossilized horse tracks that resemble El Diablo's hooves and declares the horse ancient. Bromley wonders about its origin.

Tia Zorina and the Romani agree to steal El Diablo and release it back in the Forbidden Valley, hoping to use the journey to uncover more prehistoric specimens. Bromley agrees to accompany them for scientific reasons. Carlos, an ex-member of the Romani now working for T.J., stumbles upon the theft and is knocked out.

Tuck arrives as the Romani posse departs, and Carlos recognizes him while regaining consciousness. He realizes El Diablo is missing and sets off in pursuit of Bromley. T.J. and her crew decide to follow into the valley, unsure what they will face.

In the Forbidden Valley, a Pteranodon swoops down and seizes Lope, but the extra weight causes the creature to drop him. Carlos shoots and kills the Pteranodon, saving Lope for the moment.

The group spots an Ornithomimus and gives chase to capture it. Gwangi, a deadly Allosaurus, pursues Bromley and the others, signaling the danger that lies ahead.

A Styracosaurus suddenly appears and drives Gwangi away, while Lope reveals that Carlos lied about stealing El Diablo. The truth unsettles the group as they realize Bromley’s quest may be more dangerous than expected.

Gwangi pursues the group back to their base camp and breaks free when the Styracosaurus returns. He kills Styracosaurus and Carlos, but a rockslide foils his escape attempt, leaving him temporarily incapacitated.

The surviving men secure Gwangi with ropes and haul him back to town to put on display at T.J.'s show. The captured creature becomes the main attraction, though the danger of the captive experiment remains.

On opening day, a dwarfed Romani worker sneaks in to free Gwangi but is killed when Gwangi breaks free. The crowd flees as Zorina is trampled to death, and Bromley is crushed by a broken cage piece; Gwangi slaughters an Asian elephant as he rampages.

Tuck, T.J., and Lope herd the crowd into a cathedral to escape Gwangi. The creature breaches the building, but the organ music and a flare-up cause a distraction; Tuck wounds Gwangi and throws a torch, setting the cathedral aflame. The trio escapes while Gwangi is trapped and burned alive as the building collapses.