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- Freddie Highmore as Jared Grace, Simon Grace
- Mary-Louise Parker as Helen Grace
- Nick Nolte as Mulgarath, Redcap
- Sarah Bolger as Mallory Grace
- Andrew McCarthy as Richard Grace
- Joan Plowright as Lucinda Spiderwick
- Jordy Benattar as Young Lucinda Spiderwick
- David Strathairn as Arthur Spiderwick
- Seth Rogen as Hogsqueal
- Martin Short as Thimbletack
- Lise Durocher-Viens as Mrs. Spiderwick
- Tod Fennell as Helen's Co-worker