Ringway

Ringway was a crew member on a massive space freighter in the middle of space.

He seemed to harbor a strong dislike for Captain Briggs because she ignored him. When everyone found out that he was working with the Cybermen, he held Captain Briggs, Berger, Adric, and the Fifth Doctor hostage.

When Scott and his troops moved in and mananged to kill a few of the attacking Cybermen, the Cyber Leader believed that Ringway had lied to them and decided to kill him for his deceit. Once they arrived on the bridge Ringway was killed without the Cybermen learning that he had told them the truth. (DW: Earthshock)