A mysterious creature threatens the peace of London. It sees in the dark, isn't wounded by bullets, and wherever it goes, a yellow μ Greek pops up. Scientists kidnapped, Crown jewels stolen..... Only Blake and Mortimer can stop Dr. Septimus' vengeance. They discover that the mysterious creature is none other than Olrik, hypnotized!
Michel Papineschi
Mortimer (Voice)
Jacques Frantz
Narrateur
Olivier Proust
Sharkey (Voice)
Gilbert Levy
Commissaire Pradier (Voice) Nasir (Voice) Ahmed Rassim Bey (Voice) Magon (Voice)
Yves Barsacq
Dr Grossgrabenstein (Voice) Sir Deloraine (Voice) Colonel Dorian Cartwright (Voice)
Daniel Lafourcade
Abdul (Voice)
Pierre Baton
Abdel Razek (Voice)
Jean-Pierre Leroux
Prof Labrousse (Voice)
Hervé Bellon
Prof Sato (Voice) Dr Septimus (Voice)
Jean-Claude Sachot
Juge Calvin (Voice) Sadi (Voice) Freddy (Voice) Duranton (Voice) Sir Harold Smith (Voice) Sato (Voice)
Pierre Hatet
Le Général (Voice) Basileus (Voice)
William Sabatier
Inspecteur Kendall (Voice)
Patrick Messe
Macomber (Voice)
Henri Labussière
Wilbur James (Voice)
Mathieu Buscatto
Vernay (Voice)
Jean Négroni
Docteur Longneck (Voice)
Claire Guyot
Margaret (Voice)
Michel Tugot-Doris
Sir Williamson (Voice)
Éric Legrand
Vincent (Voice)
Frédéric Cerdal
Dr Fuentes (Voice) Ragnar(Voice)
Guillaume Orsat
Morata (Voice)
