On screen
Cast
19 credited performers
Dwayne Johnson
Dr. Smolder Bravestone
Kevin Hart
Franklin 'Mouse' Finbar
Jack Black
Professor Sheldon 'Shelly' Oberon
Karen Gillan
Ruby Roundhouse
Awkwafina
Ming
Alex Wolff
Spencer Gilpin
Morgan Turner
Martha Kaply
Madison Iseman
Bethany
Ser'Darius Blain
Anthony 'Fridge' Johnson
Brittany O'Grady
Character not listed
Burn Gorman
Character not listed
Bebe Neuwirth
Nora
Danny DeVito
Eddie
Lamorne Morris
Heater Repair Guy
Marin Hinkle
Spencer's Mom
Nick Jonas
Jefferson 'Seaplane' McDonough
Rhys Darby
Nigel Billingsley
Dan Hildebrand
Character not listed
Jack Jewkes
Character not listed