Guest Stars Stephen Stanton voices Sanderson Rhys Darby voices Roger Rogers Bonnie Hunt voices Ms. Flint Nathan Fillion voices Johnny Christopher Swindle voices Fungus Bobby Moynihan voices Chet Jenifer Lewis voices Grandma Tuskmon Richard Ayoade voices Declan Janelle James voices Joy Corey Burton voices Slappy Alan S. Kim voices Ben Bob Peterson voices Roz Aubrey Plaza voices Claire Dee Bradley Baker voices Chompy Romi Dames voices Hazel Jimmy Tatro voices Skyler Julia Butters voices Lorelai Sander Argabrite voices J.J. Ethan Sandler voices Stubby Lizzardo Nohely Quiroz voices FearCo. Receptionist