Martha the Monster

Rose Byrne

Martha

Bobby Cannavale

Kevin the Monster / Doormat

Krew Boylan

Trash Monster

Kailah Cabanas

Martha (Suit)

Nicholas Brown

Kevin / Homeless Monster (suit)

Wayne Blair

The Director

Christopher Weekes

Phil

Michael Pontin

Bobby

Priscilla Bonnet

Tina

Timothy Parsons

Spike