During the Strikeforce to UFC merger, there was no fighter's debut that was more anticipated than Alistair Overeem. Nick Diaz was a close second, but the acquisition of Overeem had fans buzzing. After a five year undefeated run, they wanted to see him on the big stage. He had won championships in Dream, Strikeforce, and K-1. His accomplishments were endless. The only goal left was to win the heavyweight title in the UFC. It seemed evident that he would become champion following his domination of former champion Brock Lesnar. The newer fans were put on notice that a new heavyweight contender was here. The massive powerhouse wrestlers such as Lesnar and Shane Carwin were being phased out. A new contender had emerged, who had world class striking and great takedown defense. Then it all came crashing down, as he failed his pre-fight drug test before UFC 146. His reputation had gone downhill since the failed test. He has lost three out of his past four bouts in brutalizing fashion. Former teammates have criticized him publicly for his selfish way of training. It has been a rough two-and-half years for a once promising contender. Here are the five biggest moments that prove Alistair Overeems stock has diminished and hurt the UFC.