In the 1990 film "Total Recall," the surname of the Mars colony’s governor is Cohaagen. His full name is Vilos Cohaagen, played by Ronny Cox, and he rules Mars through an authoritarian regime that controls its mining industry and air supply.
Cohaagen is the main political force opposing Douglas Quaid, an Earth construction worker whose implanted memories lead him back to Mars. Quaid discovers that he was formerly Carl Hauser, a secret agent who defected after falling in love with the Martian freedom fighter Melina. Cohaagen had been Hauser’s ally and tries to suppress the rebellion by manipulating identities and memories.
The governor’s power depends partly on turbinium mining and partly on control of the colony’s oxygen infrastructure. He also hides the existence of an ancient alien reactor capable of creating a breathable atmosphere on Mars, which would end his control over the colony’s resources.
The spelling matters: the film’s surname is Cohaagen, with two “a” sounds represented by the letters “aa.” Variants such as “Cohagen” and “Kohagen” are common memory-based spellings, but they are not the character’s canonical name. Cohaagen dies when Quaid activates the reactor and exposes him to Mars’s atmosphere.