Dwayne Johnson

Dr. Smolder Bravestone

Kevin Hart

Franklin 'Mouse' Finbar

Jack Black

Professor Sheldon 'Shelly' Oberon

Karen Gillan

Ruby Roundhouse

Rhys Darby

Nigel Billingsley

Bobby Cannavale

Van Pelt

Nick Jonas

Jefferson 'Seaplane' McDonough

Alex Wolff

Young Spencer Gilpin

Ser'Darius Blain

Young Anthony 'Fridge' Johnson

Madison Iseman

Young Bethany Walker

Morgan Turner

Young Martha Kaply

Sean Buxton

Jogger

Mason Guccione

Gamer

Marin Hinkle

Spencer's Mom

Tracey Bonner

Fridge's Mom

Najah Jackson

Girl in Car

Natasha Charles Parker

Bethany's Mom

Kat Altman

Lucinda

Maribeth Monroe

Teacher

Missi Pyle

Coach Webb

Michael Shacket

Fussfeld

Jamie Renell

Male Gym Teacher

Marc Evan Jackson

Principal Bentley

Carlease Burke

Miss Mathers

Jason New

Bivouac Biker

Rohan Chand

Kid at Bazaar

William Tokarsky

Bread Vendor

Tait Fletcher

Scorpion Recipient

Stephen Dunlevy

Transportation Shed Guard

Rob Mars

Transportation Shed Guard

Colin Hanks

Alex Vreeke (uncredited)

Virginia Newcomb

Alex's Wife (uncredited)

Sylvia Jefferies

Jogger's Wife (uncredited)

Daniel Salyers

High School Student (uncredited)

Tim Matheson

Old Man Vreeke (uncredited)

Tad Sallee

Skater Punk (uncredited)

Ryan Baughman

Boy #1 (uncredited)

Maddie Nichols

Kid #2 (uncredited)

Ashley Lonardo

Kid #3 (uncredited)

Friday Chamberlain

Amazon Warrior (uncredited)

Ted Williams

Gypsy Cowboy (uncredited)

Juan Gaspard

The Spy (uncredited)

Scott Hunter

Van Pelt's Henchman (uncredited)

Maiya Boyd

Cute Bazaar Kid (uncredited)

Natasha Mayet

Berber Lady (uncredited)

Danny Pardo

Bazaar Vendor (uncredited)