Mason Cook

as River

as Mason

as Kyle

as Ray DiMeo

as Bart

as Aiden Odum

as Malcolm

as Young Lars / Lighthouse (voice)

as Tyler Stansfield

as Will

as Additional Children's Voices (voice)

as Young Burt

as Quinn McDaniels

as Will Vancamp

as Eddie Munster

as Eddie Munster

as Conrad - 1878

as Pete Howard

as Peter

as Eddie Baxter

as Tommy

as Cecil Wilson

as Bo

as Eight Year Old Jimmy

as Austin

as Corey

as Bobby Smith

as Casey

as Jasper Zeller

as Little Boy in Wheelchair / Kid #1 (voice)