Legends of a prehistoric creature, the link between man and beast, send American scientists on an expedition through the Himalayas. Their search for the Yeti leads them on a treacherous path through the mountains as the creature sets brutal traps to halt their pursuit. During a tense showdown deep within a cave, the team is able to capture one of the beasts. When the Yeti is brought to Los Angeles, the enraged monster breaks free from his cage. Striking from the concealment of the sewers, the beast unleashes his fury on the city. Acts of menace and destruction multiply as the police attempt to subdue the creature. Their pursuit leads to a violent confrontation with this bestial ancestor of man.

High in the Himalayas a creature is captured by an expedition and brought back to civilization. As soon as this abominable snowman escapes, disastrous mayhem unleashed itself on innocent civilization.