Coke en stock
Dr. Müller also appears in "Land of Black Gold" and "The Red Sea Sharks". In both, he helps the rebel Bab El Ehr in his attempts to overthrow the Emir, Ben Kalish Ezab. He designed Formula Fourteen, which increased the explosive properties of petrol, and sabotaged the pipelines of Arabex, the Emir's preferred petrol company. While in his initial appearance he wore a goatee and moustache and had a plump physique, in later appearances he wears a full-grown beard and is leaner, enabling him to pose as an Arab. In "The Red Sea Sharks", he had changed his name to Mull Pasha (shown in the pile of newspaper clippings near the end of the adventure), a clear reference to Glubb Pasha, the idiosyncratic British commander of the Arab legion who operated out of Jordan during the Second World War. Once Bab el Ehr is overthrown, Dr. Müller is also captured.