World-famous geneticist Professor Hülsenbeck is a man of integrity who refuses to mix science and political gain. When his findings are being used to harm humanity, he immigrates to the USA in 1933 in protest against Nazi racial politics.

• DEFA
• Gruppe "Johannisthal"
• Armin Mueller-Stahl
• Katja Paryla
• Viktor Avdyushko
• Galina Polskikh
• Norbert Christian
• Mathilde Danegger
• Valeria Marian
• Fred Delmare