CHARACTERS (in order of appearance)
| Harry Domin, General Manager of Rossum’s Universal Robots | Basil Sydney |
| Sulla, a Robotess | Mary Bonestell |
| Marius, a Robot | Myrtland LaVarre |
| Helena Glory | Kathlene MacDonell |
| Dr. Gall, head of the Physiological and Experimental Department of R. U. R. | William Devereaux |
| Mr. Fabry, Engineer General, Technical Controller of R. U. R. | John Anthony |
| Dr. Hallemeier, head of the Institute for Psychological Training of Robots | Moffat Johnston |
| Mr. Alquist, Architect, head of the Works Department of R. U. R. | Louis Calvert |
| Consul Busman, General Manager of R. U. R. | Henry Travers |
| Nana | Helen Westly |
| Radius, a Robot | John Rutherford |
| Helena, a Robotess | Mary Hone |
| Primus, a Robot | John Roche |
| A Servant | Frederick Mark |
| First Robot | Domis Plugge |
| Second Robot | Richard Coolidge |
| Third Robot | Bernard Savage |
ACT I
Central Office of the Factory of Rossum’s Universal Robots
ACT II
Helena’s Drawing Room—Ten years later. Morning
ACT III
The same. Afternoon
EPILOGUE
A Laboratory. One year later
Place: An Island. Time: The Future.