#7 The Undertaker
As far as wrestling careers go, few can claim to rival that of the Undertaker's in terms of sheer importance and relevance to the business. That being said, the Attitude Era, whilst still being a period of success for the Deadman, isn't generally considered to be his greatest hour.
Taker deserves to be on this list, but might not feature quite as high as other classifications that consider the history of the wrestling business as a whole. It's safe to say that the period between 1998-2001 was more of an experimental time for the Phenom, going through multiple character changes, some welcomed and others not so.
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While the WWF transitioned from the New Generation to the Attitude Era throughout most of 1997, Taker had to battle to keep himself relevant with the arrival of new stars such as Stone Cold and The Rock. To his credit, Taker saw where the company was going and went along with it perfectly.
He was arguably at his most culturally relevant during his Ministry of Darkness phase, fitting in with the popular Goth movement sweeping America at the time. He would then go through an even more overt gimmick change in 2000 taking on the motorbike enthusiast, 'American Badass' persona. Along with Kane he also contributed to the impressive WWF tag team division as one-half of the Brothers of Destruction.
Certainly, in terms of in-ring work, Taker's best years were still to come, but there's no denying a legend of this magnitude, whatever era you're talking about.