Nico Tortorella

Character: Thomas Reid

Juan Pablo Di Pace

Character: Oscar Reyes

Emily Hampshire

Character: Leah

Heather Matarazzo

Character: Annie

Carl Clemons-Hopkins

Character: Ted

Colleen Foy

Character: Sarah

Jake Choi

Character: Jamie

Annie Funke

Character: Laura

Cloie Wyatt Taylor

Character: Sonia

Jack Perry

Character: Paul

Garrett Clayton

Character: Jake

Khalilah Joi

Character: Vera

Anny Rosario

Character: Rachel

Patrick Starrr

Character: Self

Roze JC Zepeda

Character: Cam

Olabisi Kovabel

Character: Riley

Will von Vogt

Character: Martin

Anthony Lee Medina

Character: Victor

Remington Baig

Character: Huck

Matthew Postlethwaite

Character: Sam

Matthew Ocampo

Character: Arthur

Mateo Montez

Character: Arthur's Father

Parker Looney

Character: Evie

Jude Friedman

Character: Young Thomas

Ian Nunney

Character: Young Oscar

Jeff Witzke

Character: Gregory

Alice Prime

Character: Diana

Laura Fernanda Alejandra

Character: Smitty

Yong Kim

Character: Jamie's Father

Rebekka Lien

Character: Jamie's Mother

Alice Bang

Character: Jamie's Sister

Caitlin Spears

Character: Caroline

Levi Foster

Character: Adult Pirate

Florence Vallentine

Character: Poppy

Clinton Haddix

Character: Alfred