Buddy

Cristin Milioti

Grace

Acting

Delaney Quinn

Freddy

Acting

Topher Grace

Ben

Acting

Keegan-Michael Key

Buddy the Unicorn (voice)

Acting

Michael Shannon

Charlie the Train (voice)

Acting

Patton Oswalt

Strappy (voice)

Acting

Clint Howard

Acting

Madison Polan

Hannah

Acting

Bryson JonSteele

Derek

Acting

Bennie Taylor

Mailman Miles

Acting

Mark Aaron Buerkle

Therapist (Day Player)

Acting

Phuong Kubacki

Acting

Luke Speakman

Josh

Acting

Tristan Borders

Oliver

Acting

Eric Salazar

Dad

Acting

Rachel Appelbaum

Clocky / Mr. Mailbox

Acting