The Valley of Gwangi

A former Buffalo Bill’s Wild West Show stuntman and T.J.’s ex‑lover, driven by ambition to buy out the rodeo. He is courageous, resourceful, and willing to risk himself for others, notably saving Lope and pursuing Bromley into the Forbidden Valley. His ruthlessness is tempered by loyalty to T.J. and the group.

Owner and host of the traveling rodeo, she wants to grow attendance with El Diablo and navigate the tensions of romance and business with Tuck. She is practical, protective of her show, and ultimately courageously leads the group into the valley to recover the horse.

A British paleontologist who believes El Diablo is a fossil‑horse and becomes the expedition’s primary scientist. His ambition to collect fossils and follow the horse into the valley drives the theft scheme with the Romani, and he remains focused on discovery even as danger escalates.

An ex‑member of the Romani who now works with T.J.’s circus. He tries to intervene when El Diablo is stolen, is knocked out, and later is killed during Gwangi’s rampage. He becomes a foil that exposes the lies surrounding the expedition.

A Romani trader who claims the horse is cursed and conspires with Bromley to steal El Diablo. She represents superstition and greed, and her plans contribute to the valley’s violent unravelling until she is trampled to death in the chaos.

A young Mexican boy eager for fame who accompanies the group on a quest for fortune. He is naive but resilient, and his capture by a Pteranodon is a pivotal moment that reveals the dangers of the valley.

A fearsome Allosaurus that stalks the valley and terrorizes the expedition. Brought back to town, it proves irresistible to the crowd but ultimately is slain as the building collapses in flames.