Mark William Calaway (born March 24, 1965), better known by his ring name The Undertaker, is an American semi-retired professional wrestler currently signed to WWE, where he has worked since 1990, making him the company's longest tenured in-ring performer . Calaway began his wrestling career with World Class Championship Wrestling (WCCW) in 1984 . After wrestling for World Championship Wrestling (WCW) as "Mean" Mark Callous from 1989 to 1990, he signed with the World Wrestling Federation (WWF, now WWE) in 1990 . Calaway is regarded as one of the greatest professional wrestlers of all time .
As The Undertaker, Calaway's gimmick is a horror-themed, macabre entity who employs scare tactics and holds links to the supernatural; the character was reinvented as a biker during the early 2000s . The Undertaker is the storyline half-brother of fellow WWE wrestler Kane, with whom he has alternately feuded and teamed with as The Brothers of Destruction . Since unseating Hulk Hogan as WWF World Heavyweight Champion in 1991, The Undertaker has been involved in various pivotal storylines and matches within WWE history .
The Undertaker is known for The Streak, an unprecedented run of 21 straight victories at WWE's leading pay-per-view, WrestleMania (including main event bouts at WrestleMania 13, WrestleMania XXIV, and WrestleMania XXVI); he sustained his first loss at WrestleMania XXX to Brock Lesnar . He was also winner of the 2007 Royal Rumble and in doing so, became the first man to enter the event last and win . Among other championships, Calaway is an eight-time world champion, having held the WWF World Heavyweight Championship four times (with his third and fourth reigns being as WWF Champion and WWE Undisputed Champion, respectively), the World Heavyweight Championship three times and the USWA Unified World Heavyweight Championship once .
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