When Oscar isn't invited to Alexa's birthday party, Mortimer tries to make him feel better by telling him about a similar time in his life; ever the glowworm, Oscar sneaks back in time to help a young Mortimer overcome the sad experience.
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