#8 Mankind proves to be a tough challenger.
The Undertaker was back, and on a tear in the WWE once again. However, his character began to present some problems with booking.
Taker had been represented as being a nigh-invincible superhuman warrior, only losing when heels combined their cheating efforts to scam him out of victory. He took on mighty wrestlers, then took on whole stables of mighty wrestlers, and still kept going strong.
A former WWE writer just went after JBL for his comments HERE
The decision was made to 'humanize' The Undertaker somewhat, so that he could be booked in other ways than just an invincible cosmic force. The man chosen to humanize him was Mankind, AKA Mick Foley.
At this stage in his career, Paul Bearer and The Undertaker had parted ways and become mortal enemies. Bearer introduced Mankind to help defeat The Undertaker. To this day, no other wrestler has a better won/loss record against Taker than Mankind.
The two would appear in the second Hell in a Cell match, which is forever etched in the minds of WWE fans.