At the end of the war, Germany's most talented nuclear physicists were brought to England to discover exactly what they knew about the atomic bomb. Major Rittner - Nick Dunning Anton - Michael Shelford Fee - Alison Pettitt Werner Heisenberg - Chris McHallem Otto Hahn- Nickolas Grace Max Von Laue - Richard Howard Kurt Diebner - Sam Dale Friedrich Von Weizsacker - Michael Shelford Professor Blackett/Reader - Ian McElhinney Pianist - Mark McGrath Producer / Director - Eoin O'Callaghan Nuclear Reactions stars Nick Dunning and Nickolas Grace. At the end of WWII, Germany's most talented and formidable nuclear physicists were rounded up and brought to England. The British were keen to discover exactly what they knew about the atomic bomb, but they also wanted to ensure that the powerhouse of German thought remained intact, and capable of regenerating a defeated nation.