Unknown to Spectrum, Magnus is a Mysteron reconstruction of the original doctor, who has been killed in a road accident engineered by Captain Black (voiced by Donald Gray). During the operation, the reconstruction deliberately overruns the pulsator, inducing a seizure that kills his masked patient. Fawn removes the mask to reveal the face of Captain Scarlet (voiced by Francis Matthews), who unknown to Magnus had substituted for Tiempo. Exposed as a Mysteron agent, Magnus breaks out of sickbay and flees to Cloudbase's generator room. He is cornered by Captain Blue (voiced by Ed Bishop) and killed when he is knocked against a bare cable.