Early 20th-century adventurers find themselves fighting for survival after their hot-air balloon crashes into a remote part of the Amazon, stranding them on a prehistoric plateau.

BeastMaster chronicles the adventures of Dar, the last surviving male of the storied Sula tribe, who is blessed with the ability to communicate telepathically with the animals of his ancient world. Also endowed with the strength, courage and fighting skills of a great warrior, he uses his gifts to defend all living creatures oppressed by the forces of evil.

Mysterious deaths and unexplained disappearances begin to occur in the small seaport village of Graves Point. When a large, strange claw is discovered on an empty raft washing up on the shore, marine biologist Dr. Herbert Talley identifies it as belonging to a rare giant squid.

A group of unlikely allies are assembled to go on an expedition deep within the Amazon forest in search of new discoveries.