Helen Grace
Simon Grace
Jared Grace
Mallory Grace
Thimbletack (voice)
Mulgarath / Dr. Dorian Brauer
Calliope
Hatcher
Emiko Noizumi
Bree Kent
Lucinda Spiderwick
Valentina
Tanner Kent
Arthur Spiderwick
The Ogre
Chris
Richard Grace / Richard Grace (voice) (uncredited)
Stacy Varnow
Hubert
Yalda
Thalia
Hind
City Council President
Fencing Attendant #1
