Description:  Dino Boy in the Lost Valley is a cartoon segment about a young boy named Todd who crash-lands in a hidden South American valley filled with dinosaurs, cavemen, and other prehistoric creatures. There, he befriends a giant caveman named Ugh and a baby Brontosaurus named Bronty. The segments follow their adventures as they survive in this dangerous, yet wondrous, prehistoric world.

Premise: A boy named Todd parachutes from a plane and lands in an uncharted valley where prehistoric life has survived. Main characters:
Todd (Dino Boy): A young boy who must learn to be resourceful and work with others.
Ugh: A large caveman who rescues Todd and becomes his friend.
Bronty: A baby Brontosaurus that Todd cares for.

Setting: The "Lost Valley," a South American valley where dinosaurs, cavemen, and other prehistoric animals coexist. Adventures: Todd, Ugh, and Bronty have numerous adventures and face many dangers, such as saber-toothed tigers, but also find numerous allies.

Format: The cartoon was originally paired with the Space Ghost series, with each episode consisting of both a Space Ghost and a Dino Boy segment.