The General Staff orders the elimination of the German superman, who has become the Sentinels' main enemy. As they pursue him, the Sentinels are unaware that they will face the Übermensch, an adversary of immeasurable power.

The Sentinels must free Mazauric, the mastermind behind the Dyxenal research, before he delivers vital information about the French serum to the Germans. At the Damned, the Baron receives a visit from Diane, a German spy who promises to find Gisèle if he helps her.