An upcoming two-hour American animated television film split into two parts. Based on Craig Bartlett's Hey Arnold! TV series, it will serve as a sequel to the series finale in which Arnold found his father's journal and read about the life of his scientist parents, including their first meeting, birthing him, and a map showing the route they took to the San Lorenzo before they disappeared.
Elenco: Francesca Smith , Anndi McAfee , Mason Vale Cotton , Benjamin Flores Jr. , Lane Toran , Jamil Walker Smith , Alfred Molina , Justin Shenkarow , Olivia Hack , Nika Futterman , Dan Butler , Dan Castellaneta , Tress MacNeille , Antoinette Stella , Carlos Alazraqui , Dom Irrera , Maurice LaMarche , Kath Soucie , Danielle Judovits , Danny Cooksey , James Belushi , Craig Bartlett , Gavin Lewis , Jet Jurgensmeyer , Aiden Lewandowski , Laya DeLeon Hayes , Nicolas Cantu , Wally Wingert , Stephen Stanton .