When their trip to San Lorenzo takes a turn for the worst, Arnold and his classmate’s only hope of getting home is retracing the dangerous path that led to Arnold's parents' disappearance.
Mason Cotton
as Arnold (voice)
Benjamin Flores Jr.
as Gerald (voice)
Francesca Marie Smith
as Helga (voice)
Anndi McAfee
as Phoebe (voice)
Carlos Alazraqui
as Eduardo (voice)
Alfred Molina
as La Sombra (voice)
Justin Shenkarow
as Harold (voice)
Antoinette Stella
as Stella (voice)
Laya DeLeon Hayes
as Nadine (voice)
Jamil Walker Smith
as Paulo (voice)
Nika Futterman
as Olga (voice)
Olivia Hack
as Rhonda (voice)
