Christopher Lloyd

as Professor Hargraves

Jonathan Morgan Heit

as Arthur Milligan

Richard Gunn

as John Sanders

Charlie Plummer

as Timmy Sanders

Malia Tyler

as Madeline Andrews

Jessica Wright

as Regina Clark

Ethan Ross Wills

as Wallace Jenkins

David Naughton

as Dr. Millard Whittison

Taryn O'Neill

as June Sanders

Maia Guest

as Dr. Susan Andrews