When silly inventor Svensson gets mistaken for Swedish/American aviator Smith, he is accidentally enlisted in the military and drawn into unexpected romantic affairs.

Fridolf Rhudin
as Fridolf Ambrosius Svensson

Brita Appelgren
as Mary Lantz

Weyler Hildebrand
as Sergeant major Göransson

Karin Gillberg
as Mary Björklund

Georg Blomstedt
as Colonel Sixten Björklund, Mary's father

Sven Garbo
as Harald Smith, Swedish-American, journalist and civilian pilot, Mary's fiancé

Richard Lund
as Lieutenant

Ernst Brunman
as

Ludde Juberg
as

Einar Fagstad
as