| Episode credited cast: |
 | Mercedes Echerer | - | Narrator (voice) |
 | Jo Vossenkuhl | - | Narrator (voice) |
| Rest of cast listed alphabetically: |
| Doris Appel | - | Herself - Host |
| Richard Boyle | - | Himself - Jesuit und Astronom |
| José Funes | - | Himself - Direktor der Vatikanischen Sternwarte |
| Bernulf Kanitscheider | - | Himself - Philisoph |
| Hans-Dieter Mutschler | - | Himself - Philisoph und Theologe |
| Marcelo Sánchez Sorondo | - | Himself - Päpstl. Akademie der Wissenschaften |
| Wolfgang Treitler | - | Himself - Fundamentaltheologe |
| Ulrich Walter | - | Himself - Astronaut und Physiker |
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