#9 Mordecai
Many of you reading this may not remember Mordecai. That's probably because his stay on the main roster was extremely short. Mordecai debuted on SmackDown in April of 2004 and by July, the man who portrayed him, Kevin Thorn, was back in OVW.
Despite the brevity of his stay on SmackDown, WWE actually had big plans for Mordecai. The fact that he looked like The Undertaker but wore white instead of black was no accident. The plan was to have the two ultimately end up battling one another.
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Thanks to things beyond WWE's control that pipe dream was crushed. Thorn got involved in a bar fight where the guy he fought ended up with a serious injury and was hospitalised. WWE tried to fight Kevin's legal battle but eventually it proved to be more than it was worth.