Rollista

• Lyon Daniels — Jared Grace
• Noah Cottrell — Simon
• Mychala Lee — Mallory Grace
• Joy Bryant — Helen Grace
• Charlayne Woodard — Lucinda Spiderwick
• Christian Slater — Dr. Dorian Brauer / Mulgarath
• Alyvia Alyn Lind — Calliope
• Jack Dylan Grazer — Thimbletack
• Momona Tamada — Emiko Noizumi
• Hunter Dillon — Hatcher
• Aria Mia Loberti — Valentina
• Mellany Barros — Bree Kent