Brad Collins was a Human male. He served as a security officer aboard the USS Enterprise in the 2260s.
In 2269, after the ship's visit to Phi-11, Collins was part of a security detail which took James T. Kirk to sickbay. With Collins and most of the crew possessed by the Ur, Christine Chapel distracted Collins long enough for Kirk to strangle him unconscious. (TOS - Year Four comic: "Issue 3")
While unnamed, a similar-looking security officer who may have been Collins beamed down along with Spock to search for Kirk's landing party on Gobi III. (TOS - Year Four comic: "Issue 6")