After leaving WWE in 2006, Kurt Angle joined Total Nonstop Action Wrestling (now Impact Wrestling) where he became the inaugural and record six-time TNA World Heavyweight Champion, and the second Triple Crown winner in TNA history (as well as the only one to hold all required titles at once).
Angle is also a two-time King of the Mountain. As part of TNA, he made appearances for New Japan Pro-Wrestling (NJPW) and the Inoki Genome Federation (IGF), holding the IWGP Heavyweight Championship once. In 2013, Angle was inducted into the TNA Hall of Fame: he is the second wrestler, after Sting, to be inducted into both the WWE and TNA Halls of Fame.
Between WWF/WWE, Japan and TNA, Angle has won 21 total championships. He is the only pro-wrestler in history to have won the WWE Championship, WWE's World Heavyweight Championship, the WCW Championship, the TNA World Heavyweight Championship and the IGF's IWGP Heavyweight Championship.
Angle is also the only person to have been King of the Ring and King of the Mountain, as well as to have held both the WWE and TNA Triple Crowns. He has headlined numerous pay-per-view events for WWF/WWE and TNA, including both WrestleMania and Bound for Glory.
During a long interview on his Facebook page, Angle explained why he never faced Undertaker at WrestleMania: “We both wanted to go to Mania, but the powers that be did not. The whole reason Undertaker and I locked horns at No Way Out in 2006 is because we both wanted a match against each other at Wrestlemania that year.
So the boss gave us the next best thing… a match the month before Wrestlemania. Our match at No Way Out could possibly be one of the greatest matches in history. Undertaker is a very rare breed”.