Will Ferrell
Dr. Rick Marshall
Anna Friel
Holly
Danny McBride
Will Stanton
Jorma Taccone
Chaka
John Boylan
Enik
Matt Lauer
Matt Lauer
Bobb'e J. Thompson
Tar Pits Kid
Sierra McCormick
Tar Pits Kid
Shannon Lemke
Tar Pits Kid
Steven Wash Jr.
Tar Pits Kid
Brian Huskey
Teacher
Kevin Buitrago
Teenager
Noah Crawford
Teenager
Jon Kent Ethridge
Teenager
Logan Manus
Teenager
Ben Best
Ernie
Scott Dorel
Elder Pakuni
Sean Michael Guess
Elder Pakuni
Dennis McNicholas
Ice Cream Man
Chris Henchy
Stage Manager
Kurt Carley
Sleestak
Travis Samuel Clark
Sleestak
Daniel George
Sleestak
Todd Christian Hunter
Sleestak
Marti Matulis
Sleestak
Tim Soergel
Sleestak
Douglas Tait
Sleestak
Patrick Wedge
Sleestak
Ana Alexander
Pakuni Woman
Moran Atlas
Pakuni Woman
Jesse Golden
Pakuni Woman
Eve Mauro
Pakuni Woman
Pollyanna McIntosh
Pakuni Woman
Ania Spiering
Pakuni Woman
Paul Adelstein
Astronaut (voice)
Adam Behr
Library Skull (voice)
Daamen J. Krall
Library Skull (voice)
Leonard Nimoy
The Zarn (voice)
Michael Papajohn
Astronaut (uncredited)
Kiernan Shipka
Tar Pits Kid
Dylan Sprayberry
Tar Pits Kid (uncredited)