Christian Mikkelsen as Jens / Alf-Tore / Hjernekjell (voice)

Nasrin Khusrawi as Lisa (voice)

Aksel Hennie as Simen Sprut (voice)

Mathilde Storm as Cumilla (voice)

Christian Rubeck as Jizzmo (voice)

Bjørn Sundquist as Prof. Saltsmak (voice)

John Brungot as Egon Olsæd (voice)

Gustav Nilsen as Benner´n / Bjell (voice)

Silya Nymoen as Gynekologen (voice)

Jakob Schøyen Andersen as Hjernekjell (voice)

Amir Asgharnejad as Bollsæd (voice)

Ingrid Bolsø Berdal as Hjerniffer (voice)

Charlotte Frogner as Hjernia / Mor (voice)

Henrik Horge as Far (voice)

Stig Frode Henriksen as E-Coli Troll (voice)

Jeppe Beck Laursen as Bobby / Sykepleier (voice)

Lisa Tønne as Herr Sædberg (voice)

Ida Nilsen as Ruth-Elizabeth (voice)

Kamilla Alnes as Maja (voice)