Voice cast
Eddie Redmayne as Dug, a young Stone Age caveman.
Tom Hiddleston as Lord Nooth, an evil lord of the Bronze Age City.
Maisie Williams as Goona, a tomboyish vendor and football enthusiast in the Bronze City whom Dug befriends.
Timothy Spall as Chief Bobnar, the chieftain of Dug's tribe and his father figure.
Miriam Margolyes as Queen Oofeefa, the queen regnant of the Bronze Age City who Nooth works for.
Kayvan Novak as Dino, Lord Nooth's second-in-command who also works as a referee for the football game.
Novak also voices Jurgend, the team captain of the Bronze City's football team.
Rob Brydon as Brian and Bryan, two sports commentators in the Bronze Age City that work for Queen Oofeefa.
Brydon also voices Message Bird, a pigeon who carries messages by mimicking human speech.
Brydon also voices Gonad "Gaul", a member of the Bronze City's football team.
Richard Ayoade as Treebor, a large and cowardly caveman and member of Dug's tribe who is constantly embarrassed by his mother.
Selina Griffiths as Magma, a cavewoman and member of Dug's tribe who is the overbearing mother of Treebor.
Additional voices
Johnny Vegas as Asbo, a fidgety caveman and member of Dug's tribe who often says "Champion".
Mark Williams as Barry, a caveman and member of Dug's tribe who isn't bright and has a rock friend named Mr. Rock.
Gina Yashere as Gravelle, an injury-prone cavewoman and member of Dug's tribe.
Richard Webber as Grubup, a hungry caveman and member of Dug's tribe who will eat anything.
Simon Greenall as Eemak, a warm and funny caveman and member of Dug's tribe who the other tribe has trouble understanding.
Greenall also voices Thongo, a strong and silent caveman and member of Dug's tribe who mostly responds with a grunt.
Additional voices
Nick Park as Hognob, Dug's pet wild boar.
Antony Bayman, Richard Beek, Tom Doggart, Tim Hands, Adrian Rhodes, Victoria Stevens, Luke Walton and Ben Whitehead as additional voices
In addition to a rabbit that Dug's tribe constantly hunts every day, a Ceratosaurus and a Triceratops, similar to the ones animated by Ray Harryhausen from One Million Years B.C., are seen fighting each other at the opening of the film prior to the asteroid striking Earth. In the end credits, they go by the name Ray (Ceratosaurus) and Harry (Triceratops).