During his time with UNIT, Benton faces several alien invaders, including the Cybermen, the Daleks, and the Nestene forces. He had many run-ins with the renegade Time Lord known as the Master. Benton was always a down-to-earth example of a British infantryman and non-commissioned officer, being reliable, loyal, uncomplicated and possessing a good dose of common sense. When the Doctor asked him if he was going to comment that the TARDIS was bigger on the inside than on the outside (since everyone else has), Benton's classic reply was, "Well, that's pretty obvious, isn't it?" Aside from the regular companions and the Brigadier, Benton is the only reoccurring character in the classic series to travel in the TARDIS.