Son of Tor (1964)
Carl Denham (played by Don Glut) returns to where he had found Tor ("Tor, King of Beasts" 1962) with a friend (played by Dick Andersen). Over the plateau, their plane is attacked by a Pteranodon. Denham uses a hand grenade to destroy the creature, with it falling from the sky into the waiting jaws of Gorgo. On landing, the two friends find themselves in a prehistoric world, full with life and wonderment. They decide to split up. Denham's friend gets menaced by Godzilla, then it battles the Ymir monster. The two beasts finally plunge off a cliff into water below. Denham encounters a giant white gorilla (Torro) who is trapped in quicksand. Denham manages to free Torro. A Styracosaurus threatens Denham, with the grateful Torro defeating Denham by killing the creature. Denham's friend finds himself in more trouble, this time with a Kronosaurus that has attacked the plane, with Denham's friend killing the monster using dynamite; before any damage is done to the plane. With a loud rumbling ... (IMDB Paul Gerard Kennedy)