The Big Red is a Carcharodontosaurus which lived in the Cretaceous. When an expedition traveled through time and arrived at his era, he attacked and killed many members. Much later, a second expedition arrives in order to rescue the survivors but the Big Red attacks them and causes some deaths. They finally succeed to send back the survivors in the Present, but in the process the Big Red accidentally also brought into the Present. He goes on a rampage through Los Angeles and kills many people, but ultimately he is send back to Cretaceous where he is crushed by rocks.