Spear and Fang.
A caveman, Spear, after a deadly fishing session where a Deinosuchus nearly devoured him, returns from fishing to find his mate, son, and daughter devoured by a trio of horned Tyrannosauroidea. Distraught, he contemplates suicide before resolving to take revenge. He sees the silhouette of a dinosaur and, believing it to be one of the horned tyrannosaurs that killed his family, silently pursues it into a thicket. He comes face to face with the hornless Tyrannosaurus Fang, with two offspring with her...