Millie Davis as Ms. O

Anna Cathcart as Olympia

Isaac Kragten as Otis

Dalila Bela as Olive

Filip Geljo as Otto

Sean Michael Kyer as Oscar

Jack McBrayer as Weird Tom

Olivia Presti as Oona

Peyton Kennedy as Dr. O

Jaiden Cannatelli as Ohlm

Michela Luci as Orchid

Christian Distefano as Owen

Seán Cullen as Mayor Macklemore

Ava Preston as Polly Graph

Ashley Botting as Delivery Debbie

Madeleine Barbeau as Oksana

Eshaan Buadwal as Olaf

Christian Corrao as The Big O

Brendan Heard as Oren

Ana Sani as Annette

DeAndray Hamilton as Coach O

Lukas Engel as Assistant to Big O

Steve Paiken as Himself

Tate Yap as O'Donahue

Patrice Goodman as Boss

Jaeden Noel as Agent Obfusco

Hannah Simone as Weird Emily