| Episode cast overview, first billed only: |
 | Hansi Jochmann | - | Narrator |
 | Hans Küng | - | Himself - Theologian |
| Manfred Lütz | - | Himself - Physician & Theologian |
| José Saraiva Martins | - | Himself (as Cardinal José Saraiva Martins) |
| Mirjana Dragicevic-Soldo | - | Herself - Visionary |
| Marco Politi | - | Himself - Vatican Expert |
| Hubert Liebherr | - | Himself - Constructor & Medugorje Pilgrim |
 | Lech Walesa | - | Himself |
| Stanislaw Dziwisz | - | Himself - Archbishop of Krakow (as Cardinal Stanislaw Dziwisz) |
| Petar Ljubicic | - | Himself - Priest (as Pater Peter) |
| Hermann Geissler | - | Himself - Congregation for the Doctrine of the Faith |
| Marisette Goisneau | - | Herself - Lourdes Baths Coordinator |
| Alessandro De Franciscis | - | Himself - Lourdes Medical Supervisor |
| Ewa Czaczkowska | - | Herself - Journalist 'Rzeczpospolita' |
| Fabiana Pesci | - | Herself - Journalist 'Il mattino di Padova' |
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