100 Million BC

During the 1940s, government scientist Dr. Frank Reno (Michael Gross) lost a platoon of American soldiers in a botched time-travel experiment. When a rescue team transports the survivors -- including Reno's brother, Erik (Christopher Atkins) -- from prehistoric times to 2008, they unwittingly allow an uninvited guest to follow them. Now, a desperate group of modern Navy SEALs and their World War II-era counterparts must stop a vicious Tyrannosaurus rex from ravaging the streets of Los Angeles.