If you are watching the film and finding the dialogue strange, it might be the .
This anonymous approach to dubbing was not uncommon for the era, especially for productions where the dub was considered secondary to the original. In these cases, the dubbing studio would hire a group of professional, often uncredited, voice actors to complete the work. It's possible the cast was made up of session singers and actors who specialized in ADR (Automated Dialogue Replacement). asterix at the olympic games english dub work