Dagmara Dominczyk
Zelma (voice)

Michele Pawk
Biology (voice)

Matthew Modine
Bo (voice)

Cameron Monaghan
Sergei (voice)

Stephen Lang
Jonas (voice)

Erica D. Schroeder
Elita (voice)

Emma Kenney
Sarma (voice)

Anna O'Donoghue
Teacher #1 (voice)

Tanya Franks
Teacher #2 (voice)

Clyde Baldo
Eduards (voice)

Najla Said
New Girl (voice)

Keith Randolph Smith
Man on Train (voice)

Dan Domingues
Lauris (voice)

Florencia Lozano
Zelma's Mother (voice)

Ruby Modine
Nina (voice)

Carolyn Baeumler
Darya (voice)

Christina Pumariega
Darya's Mother (voice)

Tracy Thorne
Master of Ceremonies #1 (voice)

Laila Robins
Master of Ceremonies #2 (voice)

Cindy Cheung
Velta (voice)