"Deep in the heart of the Amazon, the Butler family was exploring an uncharted river canyon when suddenly caught up in a violent in a whirlepool, they were propelled though an underground cavern, and flung into a hostile world of giant prehistoric creatures. A world that time forgot, now befriended by a family of cave dwellers, each passing day is a lesson in survival for the Butlers in the VALLY OF THE DINOSAURS!"
- Digger - The Butler Family's canine companion.
- Gara - Gorak's wife, she has many talents in the area of healing, and knows much about the flora of the valley.
- Gorak - Head of the cave family who oversaw the rescue of the Butlers.
- Greg Butler - Katie's younger brother, he's not as cautious as his sister, and rather adventurious.
- John Butler - A school teacher, and head of the Butler Family.
- Katie Butler - Greg's older sister, she is very smart, and does her best to keep Greg out of trouble.
- Kim Butler - John's wife, who is also a sort of scientist.
- Lok - Gorak's oldest son, he is suspecious of the new comers.
- Spike - A baby stegosaurus the Butler family decides to keep as a pet.
- Tana - Gorak's youngest daughter, she is very curious about the outside world.