Robin Williams

Theodore Roosevelt

Steve Coogan

Octavius

Dick Van Dyke

Cecil

Ben Stiller

Larry Daley

Paul Rudd

Don

Ricky Gervais

Dr. McPhee

Mark Radcliffe

Executive Producer

Anne Meara

Debbie

Carla Gugino

Rebecca

Kim Raver

Erica Daley

Pierfrancesco Favino

Christopher Columbus

Shawn Levy

Director

Mickey Rooney

Gus

Bill Cobbs

Reginald

Thomas M. Hammel

Executive Producer

Patrick Gallagher

Attila the Hun

Matthew Harrison

Neanderthal #3

Ira Shuman

Executive Producer

Jody Racicot

Neanderthal #4

Rami Malek

Ahkmenrah

Jake Cherry

Nick Daley

Charlie Murphy

Taxi Driver

Mizuo Peck

Sacajawea

Kerry van der Griend

Neanderthal #1

Dan Rizzuto

Neanderthal #2

Martin Christopher

Lewis

Martin Sims

Clark

Randy Lee

Hun #1