Nico Tortorella as Thomas Reid

Juan Pablo Di Pace as Oscar Reyes

Emily Hampshire as Leah

Heather Matarazzo as Annie

Carl Clemons-Hopkins as Ted

Colleen Foy as Sarah

Jake Choi as Jamie

Annie Funke as Laura

Cloie Wyatt Taylor as Sonia

Jack Perry as Paul

Garrett Clayton as Jake

Khalilah Joi as Vera

Anny Rosario as Rachel

Patrick Starrr as Self

Roze JC Zepeda as Cam

Olabisi Kovabel as Riley

Will von Vogt as Martin

Anthony Lee Medina as Victor

Remington Baig as Huck

Matthew Postlethwaite as Sam

Matthew Ocampo as Arthur

Mateo Montez as Arthur's Father

Parker Looney as Evie

Jude Friedman as Young Thomas

Ian Nunney as Young Oscar

Jeff Witzke as Gregory

Alice Prime as Diana

Laura Fernanda Alejandra as Smitty

Yong Kim as Jamie's Father

Rebekka Lien as Jamie's Mother

Alice Bang as Jamie's Sister

Caitlin Spears as Caroline

Levi Foster as Adult Pirate

Florence Vallentine as Poppy

Clinton Haddix as Alfred