#4 Samoa Joe
Samoa Joe entered TNA to a monster push in 2005. He gained an 18 month long undefeated streak in one-on-one action and held the X Division Championship 5 times, a 2 time Tag Team Champion, a TV Champion and also held the World Heavyweight Championship.
Although Joe won the Heavyweight Championship in one of TNA's all-time greatest matches (vs. Kurt Angle at Lockdown 2008), Joe's reign actually hurt his chances of a better position on this list due to how poor it was. Strangely, he barely had any entertaining matches at all during the reign, even when sharing the ring with Kurt Angle and AJ Styles, and wouldn't have another great Championship match until he lost it to Sting at Bound For Glory 2008.
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Joe still makes the top 5 due to the high number of excellent matches he has had with TNA, especially with the like of AJ Styles, Christopher Daniels, Kurt Angle and Sting, among others.