After discovering that young Mortimer doesn't have any friends, Oscar helps him start a new club on campus; but the monsters are forced to hide their newfound friendship from the school and Stuart.
Cast:
Elliott Smith
Oona Laurence
Julia Pott
Sam Lavagnino
Ramone Hamilton
Indie Nameth
Antonio Corbo
Charlyne Yi
Nikki Castillo
Bobby Moynihan
Jo Firestone
Lesley Nicol
Lorraine Toussaint
Danny Pudi
Lolly Adefope
Aimee Mann
Maria Bamford
Elsie Fisher
Cole Escola
Richard Masur