The Land Before Time is unrelated to dinosaurs.
The Land Before Time . Produced by Sullivan Bluth Studios , Amblin Partners ' Amblin Entertainment and Lucasfilm ( despite not receiving an official credit nor the film 's marketing bearing the studio 's logo ) , it features dinosaurs living in the prehistoric times . The plot concerns a young Brontosaurus named Littlefoot who is orphaned when his mother is killed by a Tyrannosaurus . The Land Before Time (TV series) . The main antagonists in the series are Red Claw , an evil villainous Tyrannosaurus , and Screech and Thud , two henchmen Utahraptors .