Will Ferrell as Dr. Rick Marshall

Anna Friel as Holly

Danny McBride as Will Stanton

Jorma Taccone as Chaka

John Boylan as Enik

Matt Lauer as Matt Lauer

Bobb'e J. Thompson as Tar Pits Kid

Sierra McCormick as Tar Pits Kid

Shannon Lemke as Tar Pits Kid

Steven Wash Jr. as Tar Pits Kid

Brian Huskey as Teacher

Kevin Buitrago as Teenager

Noah Crawford as Teenager

Jon Kent Ethridge as Teenager

Logan Manus as Teenager

Ben Best as Ernie

Scott Dorel as Elder Pakuni

Sean Michael Guess as Elder Pakuni

Dennis McNicholas as Ice Cream Man

Chris Henchy as Stage Manager

Kurt Carley as Sleestak

Travis Samuel Clark as Sleestak

Daniel George as Sleestak

Todd Christian Hunter as Sleestak

Marti Matulis as Sleestak

Tim Soergel as Sleestak

Douglas Tait as Sleestak

Patrick Wedge as Sleestak

Ana Alexander as Pakuni Woman

Moran Atlas as Pakuni Woman

Jesse Golden as Pakuni Woman

Eve Mauro as Pakuni Woman

Pollyanna McIntosh as Pakuni Woman

Ania Spiering as Pakuni Woman

Paul Adelstein as Astronaut (voice)

Adam Behr as Library Skull (voice)

Daamen J. Krall as Library Skull (voice)

Leonard Nimoy as The Zarn (voice)

Michael Papajohn as Astronaut (uncredited)

Kiernan Shipka as Tar Pits Kid

Dylan Sprayberry as Tar Pits Kid (uncredited)

Zach Callison as Tar Pits Kid (uncredited)