Jake Kasdan Director, Screenwriter, Producer Dwayne Johnson Bravestone Actor, Producer Kevin Hart Mouse Actor Jack Black Oberon Actor Karen Gillan Ruby Actor Awkwafina Ming Actor Nick Jonas Seaplane Actor Alex Wolff Spencer Actor Morgan Turner Martha Actor Ashley Scott Ashley Actor Madison Iseman Bethany Actor Ser'Darius Blain Fridge Actor Danny DeVito Eddie Actor Danny Glover Milo Actor Rhys Darby Nigel Actor Colin Hanks Alex Actor Rory McCann Jurgen the Brutal Actor Marin Hinkle Janice Actor Vince Pisani Pharmacy Manager Actor Dorothy Steel Village Elder Actor Jennifer Patino Bravestone's Mother Actor Madison Johnson Little Bethany Vreeke Actor Dania Ramirez Lady in Red Actor Derek Russo Key Master Actor Jeff Pinkner Screenwriter, Executive Producer Scott Rosenberg Screenwriter, Executive Producer Dany Garcia Producer Hiram Garcia Producer Matthew Tolmach Producer Ted Field Executive Producer David B. Householter Executive Producer Melvin Mar Executive Producer William Teitler Executive Producer Mike Weber Executive Producer Gyula Pados Cinematographer Mark Helfrich Film Editing Steve Edwards Film Editing Tara Timpone Film Editing Henry Jackman Original Music Bill Brzeski Production Design Andrew Max Cahn Art Director Drew Monahan Art Director Brian Stultz Art Director Danielle Berman Set Decoration Louise Mingenbach Costume Design Nicole Abellera Casting Jeanne McCarthy Casting