Jim Carrey as Walter Sparrow / Fingerling

Virginia Madsen as Agatha Sparrow / Fabrizia

Logan Lerman as Robin Sparrow

Danny Huston as Isaac French / Dr. Miles Phoenix

Lynn Collins as Suicide Blonde / Mrs. Dobkins / Young Fingerling's Mother

Rhona Mitra as Laura Tollins

Mark Pellegrino as Kyle Finch

Ed Lauter as Father Sebastian

David Stifel as Hotel Clerk

Corey Stoll as Sergeant Burns

Bud Cort as Dr. Sirius Leary

Michelle Arthur as Sybil

Paul Butcher as Young Fingerling / Young Walter

Troy Kotsur as Barnaby

Patricia Belcher as Dr. Alice Mortimer

Shannon Gayle as Lucinda

Bob Zmuda as Desk Clerk

Lesli Margherita as Attractive Coed

Tara Karsian as Box Company Clerk

Walter Soo Hoo as Chinese Restaurant Owner