- Woolly mammoth as Peter Griffin
- Basilosaurus as Lois Griffin
- Embolotherium as Chris Griffin
- Platybelodon as Meg Griffin
- Smilodon as Brian Griffin
- Doedicurus as Stewie Griffin
- Megatherium as Carter Pewterschmidt
- Mylodon as Barbara Pewterschmidt
- Argentavis as Silas Pewterschmidt
- American cave lion as Patrick Pewterschmidt
- Glyptotherium as Bertram
- Diatryma as Glenn Quagmire
- Bullockornis as Dan Quagmire
- Dromornis as Ida Davis
- Brontotherium as Joe Swanson
- Procoptodon as Bonnie Swanson
- Casteroides as Susie Swanson
- Sthenictis as Kevin Swanson
- Xenosmilus as Bud Swanson
- Pygmy elephant as Diane Simmons
- Giant bee as Jake Tucker
- Columbian mammoth as Tom Tucker
- Steppe mammoth as Joyce Kinney
- Dinornis maximus as Ernie the Giant Chicken
- Megalodon as Dr. Hartman
- Amphicyon as Tricia Takanawa
- Phorusrhacos as Angela
- Wonambi as Gloria Ironbachs
- Aurochs as Horace
- Kairuku as Sonja
- Chamitataxus as O.J Simpson
- Acrophoca as Ollie Williams
- Miracinonyx as James Woods
- Ancylotherium as Consuela
- Megalictis as God
- Elephant bird as Nicole (Ernie the Giant Chicken's Wife)
- Giant fossa as Jesus Christ
- Australopithecus as Kool-Aid Man
- Dinofelis as Vinny
- Thylacosmilus as Evil Stewie
- Quagga as Retep
- Epigaulus as Kopa
- Purussaurus as Mort Goldman
- Amebelodon as Neil Goldman
- Gomphotherium as Muriel Goldman
- Macrauchenia as Al Harrington
- Meiolania as Bruce
- Cape lion as Kopa
- Puijila as Fouad
- Squalodon as Opie
- Armbruster's wolf as John Herbert
- Haast eagle as Mayor West
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