Andrew Varela (Arthur), Brooklyn Shuck (Little Bertie/Nina), Holly Stauder (Janice), Jim DeSelm (Michael Barron), Kelly Anne Clark (Rose White), Michael Accardo (Nathan), Nancy Voights (Leona Bloom), Olivia Renteria (Teen Bertie), Presley Ryan (Little Cee Cee), Samantha Pauly (Teen Cee Cee), Shoshana Bean (Cee Cee Bloom), Travis Taylor (John Perry), Whitney Bashor (Bertie White)