Michael Douglas Ellis (better known by his nickname "Cowboy") was a houseguest in Big Brother 5. He received 3 out of 7 Jury votes and was named the runner-up, losing to his long standing ally Drew Daniel. He was involved in the Project DNA twist where he learned he was competing with his half-sister Jennifer "Nakomis" Dedmon, whom he decided to evict at the final four stage of the game.
Michael was one of the candidates eligible to be voted into Big Brother All Stars. He, however, was not chosen to re-enter the game. Later he appeared in Big Brother 11 as the candidate for the Off-Beat Clique. Once again, Michael did not re-enter the game as all the members of the Off-Beat clique dropped from the Endurance challenge.