Freddie Highmore
Jared Grace / Simon Grace
Sarah Bolger
Mallory Grace
David Strathairn
Arthur Spiderwick
Mary-Louise Parker
Helen Grace
Nick Nolte
Mulgarath
Joan Plowright
Aunt Lucinda Spiderwick
Andrew McCarthy
Richard Grace
Seth Rogen
Hogsqueal (voice)
Martin Short
Thimbletack (voice)
Jordy Benattar
Young Lucinda Spiderwick
