Big Cast

Tom Hanks stars as Josh Baskin, a young boy who turns into an adult overnight and navigates the challenges of adulthood with a childlike perspective.

Elizabeth Perkins plays Susan, a colleague of Josh who becomes his love interest as he continues his journey as an adult.

Robert Loggia portrays MacMillan, the owner of the toy company where adult Josh starts working and forms a special bond with him.

John Heard appears as Paul, a supportive colleague of Josh who helps him adjust to his new adult life.

Jared Rushton takes on the role of Billy, Josh's best friend who helps him navigate the challenges of being an adult.

David Moscow plays Young Josh, the character before he magically transforms into an adult, portrayed by Tom Hanks.

Jon Lovitz is Scotty Brennen, a colleague of Josh who becomes envious of his success and tries to uncover his secret.

Mercedes Ruehl appears as Mrs. Baskin, Josh's concerned mother who searches for him as he navigates his new adult life.

Josh Clark portrays Mr. Baskin, Josh's father who is worried about his sudden disappearance and transformation.

Kimberlee M. Davis plays Cynthia Benson, a character within the movie's world where adult Josh finds himself working and adapting to.

Oliver Block portrays Freddie Benson, a character within the movie's world who interacts with adult Josh during his time working at the toy company.

Erika Katz is Cynthia's Friend, a character within the movie who adds to the backdrop of the world in which adult Josh finds himself as he navigates his new life.