 | Karel Roden als Slender Man |
 | Aaron Stanford als Anthony Tregoni |
 | Joaquim de Almeida als Mangini |
 | Ben Gazzara als Vatican's Banker |
| Maxime Alexandre | Director |
| Philippa Goslett | Writer |
| Maxime Alexandre | Writer |
| Jean Marc Mirete | Costume Design |
| Marie Christine Vanden Eede | Executive Producer |
| Inigo Lezzi | Producer |
| Yoohan Leyssens | Editor |
| Claude Samard | Original Music Composer |
| Cristina Pietropaolo | Production Design |
| Gauthier Broze | Producer |
| Benedikt Van der Vorst | Producer |
| Teresa Razzauti | Casting |
| Inigo Lezzi | Executive Producer |
| Gaia Zambelli | Set Decoration |
| Maxime Alexandre | Director of Photography |
| Cosimo Milone | Casting |
| Marie Christine Vanden Eede | Writer |
| Marie Christine Vanden Eede | Producer |
| Peggy Bernaerts | Key Makeup Artist |
