Klaus

Jason Schwartzman

Jesper (voice)

J.K. Simmons

Klaus (voice)

Rashida Jones

Alva (voice)

Joan Cusack

Mrs. Krum (voice)

Norm Macdonald

Mogens (voice)

Will Sasso

Mr. Ellingboe (voice)

Sergio Pablos

Pumpkin / Olaf (voice)