Oona Laurence
Hedgehog (voice) (20 eps)
Julia Pott
Susie (voice) (20 eps)
Asher Bishop
Oscar (voice) (20 eps)
Bobby Moynihan
Mortimer / Melvin (voice) (10 eps)
Sam Lavagnino
Pepper (voice) (8 eps)
Ethan Maher
Additional Voices (voice) (6 eps)
Ramone Hamilton
Max (voice) (5 eps)
Indie Nameth
Lucy (voice) (5 eps)
Fortune Feimster
Mrs. Goose (voice) (5 eps)
Alia Shawkat
Blanche (voice) (5 eps)
Kimiko Glenn
Margot (voice) (5 eps)
Cedric the Entertainer
Moon (voice) (4 eps)
Nikki Castillo
Betsy (voice) (4 eps)
Cole Sanchez
Additional Voices (voice) (4 eps)
Whoopi Goldberg
Barb (voice) (4 eps)
Charlyne Yi
Alice (voice) (3 eps)
Naomi Hansen
Pajamas (voice) (3 eps)
Kathleen Wilhoite
Sue (voice) (3 eps)
Lesley Nicol
Ramona (voice) (3 eps)
Rylee Alazraqui
Additional Voices (voice) (3 eps)
Mike Birbiglia
Howard (voice) (2 eps)
Richard Kind
Shark (voice) (2 eps)
Alexa Nisenson
Alexa (voice) (2 eps)
Luke Lowe
Additional Voices (voice) (2 eps)
Andre Robinson
Oliver (voice) (2 eps)
Stephen Root
Stuart (voice) (2 eps)
Kevin Michael Richardson
Additional Voices (voice) (2 eps)
Wallace Shawn
Barry (voice) (2 eps)
Keith Ferguson
Additional Voices (voice) (2 eps)
Elijah Wood
Saxophone (voice) (1 eps)
Dexter Hobert
Additional Voices (voice) (1 eps)
Alfred Molina
Andy (voice) (1 eps)
Paula Poundstone
Paulette (voice) (1 eps)
Kate Flannery
Georgina (voice) (1 eps)
Laraine Newman
Hedgehog's Mom (voice) (1 eps)
Roz Ryan
Additional Voices (voice) (1 eps)
John Hodgman
Bartholomole (voice) (1 eps)
Kathleen Turner
Mole Judge (voice) (1 eps)
Justin Felbinger
Dungeon Doug (voice) (1 eps)
Remy Edgerly
Mystical Alien (voice) (1 eps)
Jack Stanton
Additional Voices (voice) (1 eps)
Cooper J. Friedman
Caboodle (voice) (1 eps)
Kent Osborne
Alligator Chef (voice) (1 eps)
Antonio Raul Corbo
Baby Dylan (Alice) (voice) (1 eps)
Steve Berg
Harry (voice) (1 eps)
Aparna Nancherla
Oddjobs (voice) (1 eps)