Big Daddy, voiced by the late Michael Clarke Duncan, is the leader of the Tinysauruses. He is the voice of authority in the Tinysaurus herd. He has been met with much derision from the younger Tinysauruses, of whom he is over-protective. His name is doubly ironic, considering he is short even for a Tinysaurus, being dwarfed by his own daughter, Lizzie. Interestingly, although all of the children refer to him as "Big Daddy", only Lizzie appears to be his daughter. She is the only one who calls him "Dad", and when he is speaking to Daddy Topps at the end of the film, he mentions that he is grateful that "You also saved my daughter's life." Big Daddy is one of the Tinysauruses that appears in The Land Before Time XII: The Great Day of the Flyers in the song "Flip, Flap and Fly".