هارولد والقلم السحري

Zachary Levi

Harold

Lil Rel Howery

Moose

Benjamin Bottani

Mel

Zooey Deschanel

Terry

Tanya Reynolds

Porcupine

Jemaine Clement

Gary

Alfred Molina

Narrator

Pete Gardner

Detective Love

Camille Guaty

Junior Detective Silva

Ravi Patel

Prasad

Zele Avradopoulos

Ms. Hemm

Boston Pierce

Supreme Bro #1

Salathiel Murphy

Supreme Bro #2

Vartan

Mayhem

Brisco De Poalo

Kid (Library)

Lauren Halperin

Kid's Mom (Library)

Seth Zane Robbins

Oscar

Catherine Davis

Kat