Cristin Milioti

Grace

Delaney Quinn

Freddy

Topher Grace

Ben

Keegan-Michael Key

Buddy the Unicorn (voice)

Michael Shannon

Charlie the Train (voice) / Willie (voice)

Patton Oswalt

Strappy (voice)

Clint Howard

George (voice)

Madison Polan

Hannah

Bryson JonSteele

Derek

Mark Aaron Buerkle

Therapist (Day Player)

Phuong Kubacki

Luke Speakman

Josh