#3 Sting
It was the huge return no one expected, but in late 2005 it was revealed that WCW Icon Sting planned on coming out of semi-retirement for a full-time TV run with TNA.
Sting returned at Final Resolution 2006, teaming with Christian Cage to defeat Jeff Jarrett and Monty Brown. Sting played up the majority of the year with a retirement angle, that ultimately ended with he winning the NWA World Championship at Bound For Glory, over Jeff Jarrett. From here, Sting would win the TNA World Championship 4 times, as well as the Tag Team Championship.
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He had the best match of his career since at least 1999, with Kurt Angle at Bound For Glory 2007, and went onto have many more thrilling matches with AJ Styles, Samoa Joe, Christian Cage, Jeff Jarrett, Mick Foley and many more.
He was rightfully picked as the inaugural inductee into the TNA Hall of Fame in 2012, and signed a legends deal with WWE in 2014.