Frédéric Joliot-Curie as Self - Professor

Raoul Dautry as Self - Rustningsminister

Henki Kolstad as Sersjant Einar Skinnarland

Johannes Eckhoff as Fenrik Knut Hauglund

Claus Wiese as Fenrik Joachim Rønneberg

Øyvind Øyen as Major Professor Leif Tronstad

Andreas Aabel as Fenrik Kasper Idland

Odd Rohde as Sersjant Birger Strømsheim

Rolf Sørlie as Self - Ingeniør

Torstein Skinnarland as Self - Damvokter

Lew Kowarski as Self - Laboratoriesjef

H.H. Halban as Self - Professor

Allier as Self - Sprengstoff-offiser

Jens A. Poulsson as Self - Fenrik

Arne Kjelstrup as Self - Sersjant

Claus Helberg as Self - Sersjant

Knut Haukelid as Self - Fenrik

Hans Storhaug as Self - Sersjant

Fredrik Kayser as Self - Sersjant

Knut Lier-Hansen as Self

David Knudsen as Generaldirektør Axel Aubert

Thorleif Reiss as Ingeniør Jomar Brun

Finn Bernhoft as En vaktmann

Einar Vaage as En maskinist

Halvor Haugen as En gammel mann

Ola Hansen as Sjåfør

Harald Schwenzen as Generaloberst Nicolaus von Falkenhorst

Alf Nøkle as En utsending

Stevelin Urdahl as En militæringenør

Folkman Schaanning as En teknisk rådgiver

Hartvig Kiran as Kommentarer lest av