Over the course of the play, a number of renowned physicists are mentioned. Many of them are referenced in the context of their work with either Bohr or Heisenberg. This is the order they appear in the script:
- Max Born
- Pascual Jordan
- Carl von Weizsäcker
- Rozental Petersen
- Christian Møller
- Samuel Goudsmit
- Albert Einstein
- Wolfgang Pauli
- Otto Frisch
- Lise Meitner
- Arnold Sommerfeld, Max von Laue, and Karl Wirtz
- Otto Hahn – credited with the discovery of fission
- Fritz Strassmann
- Enrico Fermi
- John Wheeler
- Robert Oppenheimer
- Erwin Schrödinger
- Hendrik Casimir
- George Gamow
- Oskar Klein
- James Chadwick
- Victor Weisskopf
- Fritz Houtermans
- Edward Teller
- Leó Szilárd
- Paul Dirac
- H.A. Kramers
- George Uhlenbeck
- Rudolph Peierls
