Guest Stars Pendleton Ward voices Ellis P Audrey Bennett voices Astrid Jeff Bennett voices Evil Choose Goose John DiMaggio voices Jake Jeremy Shada voices Finn Phil LaMarr voices Dog Cake Phil LaMarr voices Nightmare Cake Phil LaMarr voices Beard Guy Marc Maron voices Squirrel Pendleton Ward voices Old Man Cake Pendleton Ward voices Nerdy Alien Voice Jeremy Shada voices Coffee Guy Jeremy Shada voices Woodpecker Co Starring Sharon Horgan voices Additional Voices Dee Bradley Baker voices Additional Voices Jeff Bennett voices Additional Voices Marc Maron voices Additional Voices Maria Bamford voices Additional Voices Jim Cummings voices Additional Voices Grey DeLisle Griffin voices Additional Voices