Pekka Puupää and Pätkä, who return to Helsinki from an unsuccessful variety show tour, are forced into refresher training, where they are trained as frogmen. During the diving exercises, the friends encounter the mermaid Helmi, whom they help into the bathtub at home, to Justiina's shock. The friends, who have become civilians, eventually end up on a plane bound for Suez, being cornered by UN soldiers.
as Pekka Puupää
as Pätkä
as Justiina Puupää
as Helmi
as Pikkarainen
as Saastamoinen
as Vääpeli
as Mattsonska
as UN-soldier #2
as Kalle Kovanen
as Referee
as A.K. (uncredited)
as V.P. (uncredited)
as Amalia (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (voice) (uncredited)
