Joy Bryant

~ as ~

Helen Grace

Noah Cottrell

~ as ~

Simon Grace

Lyon Daniels

~ as ~

Jared Grace

Mychala Lee

~ as ~

Mallory Grace

Jack Dylan Grazer

~ as ~

Thimbletack (voice)

Christian Slater

~ as ~

Mulgarath / Dr. Dorian Brauer

Alyvia Alyn Lind

~ as ~

Calliope

Hunter Dillon

~ as ~

Hatcher

Momona Tamada

~ as ~

Emiko Noizumi

Mellany Barros

~ as ~

Bree Kent