Åke Söderblom
— Hans Lövgren
Margareta Fahlén
— Gabriella Strandberg
Olof Winnerstrand
— Claes-Herman Sundelius
Barbro Larsson
— Diana Sundelius
Douglas Håge
— Oscar
Börje Mellvig
— Stenström
Sven Lindberg
— Lovén, Zoologist
Jeanne Fusier-Gir
— Lövgren's Housemaid
Pierre Bertin
— UNESCO Director-General
René Alié
— Policeman (uncredited)
Odette Barencey
— Woman (uncredited)
Albert Bour
— Fish Salesman (uncredited)
Gil Delamare
— Policeman (uncredited)
Moustache
— Oscar the Seal (uncredited)
Rognoni
— Zoo Owner (uncredited)
Pierre Sergeol
— Restaurant Owner (uncredited)
Made Siamé
— Fish Seller (uncredited)