Michael Douglas Ellis (better known by his nickname "Cowboy") was a HouseGuest on Big Brother 5. He received 3 of the 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.