Kalle Blomkvist and his friends intervene when a professor and his little son Rasmus are kidnapped.
Kalle Blomkvist
Anders Bengtsson
Eva-Lotta Lisander
Rasmus Rasmusson
Sixten
Benka
Jonte
Policeman Björk
Nicke Karlsson
Peters
Prof. Rasmusson
Kalle's Father
Kalle's Mother
Mia Lisander
Stenberg
Blom
Eva-Lotta's Father (uncredited)
Berggren (uncredited)
Chief Constable Öman (uncredited)
State Police (uncredited)
