Madelyn Walton/Blake
— Cassady mcClincy

Cameron Porter
— Dylan O'Brien

Ariana Thorn
— Sophie Thatcher

OTHERS
Older Madelyn by Crystal Reed
Older Cameron still by Dylan O'Brien
Young Madelyn by Violet McGraw
Young Cameron by Noah Jupe
Younger Ariana by Elle Fanning
Everett Walton by Joseph Morgan