After the two Yeti-that Dr. Harry Olson, an American paleoanthropologist, and his wife, Dixie, brought home from the mountains of Mongolia-escaped from the Cinder Mountain Research Facility and were killed by police, one of the scientists in Harry's anthropology department at California Pacific University, Dr. Millie Harbaum, uses sperm and an egg, taken from the two Yeti before they escaped, to create a baby Yeti and implants the embryo into a female chimp. But unbeknownst to Harry, Millie has added human DNA to the embryo, actually creating a chimera. When the baby, Roku, is born, he is clearly not a full Yeti, and Millie is forced to confess what she has done. Horrified, the university demands that the infant be destroyed immediately. But Millie flees before they can act, taking Roku with her and unleashing a chain of events that may have deadly consequences, not only for Roku and Millie, but for humanity as well...