Dwayne Johnson as Dr. Xander

Jack Black as Professor Sheldon

Kevin Hart as Franklin

Karen Gillan as Ruby Roundhouse

Nick Jonas as Jefferson

Bobby Cannavale as Professor Russell Van Pelt

Ser’Darius Blain as Anthony

Ser’Darius Blain as Anthony

Madison Iseman as Bethany Walker

Morgan Turner as Martha Kaply

Alex Wolff as Spencer Gilpin

Rhys Darby as Nigel Billingsley