Marc Cory

Marc Cory was a Space Security Agent assigned to investigate the Dalek presence on the planet Kembel.

Profile
To carry out his mission, Cory landed on Kembel with crew members Jeff Garvey and Gordon Lowery, who did not know the true purpose of the expedition. Garvey, however, had gotten infected by a Varga plant and made into a homicidal creature. Cory informed Lowery of the mission. Cory was forced to kill him as he had already killed Garvey.

Marc Cory discovered the Dalek base and Kembel and the Galactic Alliance against the solar system. He recorded a message warning of the Dalek plot to destroy the sol system, but was himself was later exterminated by the Daleks. (DW: Mission to the Unknown)

Bret Vyon and Kert Gantry went to Kembel to find out what had happened to Cory. They found Cory's skeletal remains, as well as a recorded message warning of the Daleks' plans. (DW: The Daleks' Master Plan)

Behind the Scenes
As no regular cast members appeared in Mission to the Unknown, Marc Cory essentially acted as the hero of that story.