Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
A commanding officer or CO was, according to Ben Jackson, "the boss" of a military installation. The First Doctor seemed unfamiliar with the term, and therefore had to get Ben to translate it for him. (TV: The Tenth Planet)