If you loved The Valley of Gwangi, try Superman II: The Richard Donner Cut
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Theysit in Adventure / Science Fiction territory. If that's the register that drew you to The Valley of Gwangi, the second film will land in a comparable space — through a different lens.
What Superman II: The Richard Donner Cut is
You live among humans as an alien hero, but then chaos erupts. The director's vision brings a darker tone.

