Pekka ja Pätkä sammakkomiehinä

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.

Comedy

Esa Pakarinen

(Pekka Puupää)

Masa Niemi

(Pätkä)

Siiri Angerkoski

(Justiina Puupää)

Sirkka-Liisa Wilén

(Helmi)

Armas Jokio

(Pikkarainen)

Pentti Viljanen

(Saastamoinen)

Pentti Irjala

(Vääpeli)

Juhani Kumpulainen

Irja Kuusla

(Mattsonska)

Tommi Rinne

Otto Noro

Mikko Niskanen

(UN-soldier #2)

Leena Pulkkinen

Raili Kuusisto

Martti Seilo

Nestori Lampi

Einari Ketola

(Kalle Kovanen)

Spede Pasanen

Matti Aulos

(Referee)

Matti Dahlberg

(A.K. (uncredited))

Anton Soini

(V.P. (uncredited))

Fiinu Autio

(Amalia (uncredited))

Sacy Sand

((uncredited))

Erkki Poikonen

((uncredited))

Kalle Sulkunen

((uncredited))

Saulo Haarla

((uncredited))

Sirkka Breider

((uncredited))

Hannes Veivo

((uncredited))

Kaarlo Wilska

((uncredited))

Matti Lehtelä

((uncredited))

Vilho Ruuskanen

((uncredited))

Arvo Murtokallio

((uncredited))

Heikki Kuvaja

((uncredited))

Heimo Karppinen

((uncredited))

Viljo Voipio

((uncredited))

Vihtori Välimäki

((uncredited))

Pentti Taivainen

((uncredited))

Jussi Hirki

((uncredited))

Pentti Lähteenmäki

((uncredited))

Matti Kuusla

((uncredited))

Anu Kilpiö

((uncredited))

Uljas Kandolin

((uncredited))

Heimo Lepistö

((uncredited))

Alf Salin

((uncredited))

Aarre Lepistö

((uncredited))

Niilo Ihamäki

((voice) (uncredited))