Jason Schwartzman as Jesper (voice)

J.K. Simmons as Klaus (voice)

Rashida Jones as Alva (voice)

Joan Cusack as Mrs. Krum (voice)

Norm Macdonald as Mogens (voice)

Will Sasso as Mr. Ellingboe (voice)

Sergio Pablos as Pumpkin / Olaf (voice)

Mila Brener as Ellingboe Girl 3 (voice)

Neda Margrethe Labba as Margu (voice)

Sydney Brower as Ellingboe Girl (voice)

Teddy Blum as Small Ellingboe Boy (voice)

Julian Zane as Krum Boy (voice)

Emma Shannon as Creepy girl 1 (voice)

Kendall Joy Hall as Annelise (voice)

Sky Alexis as Ellingboe Girl 2 (voice)

Tucker Meek as Ellingboe Boy / Krum Boy (voice)

Amanda Philipson as Ellingboe Councilwoman (voice)

Finn Carr as Ellingboe Boy 1 (voice)

Lucian Perez as Krum Boy / Creepy Boy 2 (voice)

Emma Yarovinsky as Little Krum Girl (voice)

Jaeden Bettencourt as Krum Boy / Jesper Son (voice)

Hailey Hermida as Krum Girl 1 (voice)

Evan Agos as Ellingboe Boy (voice)

Leo Miller as Ellinboe Boy 5 (voice)

Bailey Rae Fenderson as Creepy Girl 2 (voice)

Ayden Soria as Creepy Boy 1 (voice)

Reiulf Aleksandersen as Adult Saami (voice)

Matthew McCann as Additional Kids Voices (voice)

Hudson West as Additional Kids Voices (voice)

Joaquin Obradors as Boy (voice)