The main event saw WWE Champion Brock Lesnar defeat The Undertaker to retain his championship in a match where a chain was hung from a pole and the first man to reach it could use it as a legal weapon in what was called a Biker Chain match.

In a standard match for the WWE United States Championship, the Big Show defeated Eddie Guerrero to win the title.

No Mercy was first held by World Wrestling Entertainment (WWE) as a United Kingdom-exclusive pay-per-view (PPV) in May 1999.

[1] The event featured nine professional wrestling matches with outcomes predetermined by WWE script writers.

[4][5] On the September 4 episode of SmackDown!, Angle defended the championship against The Undertaker, however, the match ended in a no contest after Lesnar interfered and attacked them both with a steel folding chair; Angle retained the championship as a result of Lesnar's interference.

[6][7] On the September 18 episode of SmackDown!, Angle defended the title against Lesnar in a 60-minute Iron Man match.

General manager Stephanie McMahon, who announced that Lesnar would face The Undertaker at No Mercy for the WWE Championship.

[12][13] One of the featured bouts on the undercard saw the WWE United States Champion Eddie Guerrero defending the championship against Big Show.

The events leading up to this match began on the October 9 episode of SmackDown!, when it was announced that Guerrero would face Big Show at No Mercy for the title.

On the September 18 episode of SmackDown!, Angle lost an Iron Man match to Brock Lesnar for the WWE Championship.

[17] On the October 9 episode of SmackDown!, Linda McMahon made Vince agree that if he lost the match, he would resign as WWE chairman.

[12] Before No Mercy aired live on pay-per-view, Billy Kidman faced Shannon Moore on Sunday Night Heat, one of WWE's secondary TV programs.

After both teams performed a number of offensive maneuvers on each other, Shaniqua, the Basham Brothers' valet, struck Bradshaw with a club.

Vince had altered the rules of the match, including the stipulation that Stephanie could defeat him by pinfall or submission, but he had to force her to quit.

Furthermore, the loser of the match had to surrender their position in the company (Chairman or general manager for Vince and Stephanie, respectively).

The match ended when Vince made Stephanie pass out, by choking her out with a lead pipe.

[19][22] The second featured bout on the undercard was a standard match for the WWE United States Championship between Eddie Guerrero, and Big Show.

[19][22] The main event was a Biker Chain match for the WWE Championship between Brock Lesnar and The Undertaker.

After enduring a series of punches from Lesnar, The Undertaker attempted to take the chain down, but the lights in the arena went out and he climbed back down to the ring.

[26] The professional wrestling section of the Canadian Online Explorer website rated the entire event a 4 out of 10 stars.

Heyman booked a Handicap match, in which the Undertaker faced Brock Lesnar and the Big Show.

The Undertaker did, however, win the contest, and announced he wanted a Buried Alive match against Vince McMahon.

On the November 6 episode of SmackDown!, John Cena was offered an opportunity to become the final member of Team Lesnar for the traditional five-on-five elimination tag match at Survivor Series.

Cena rejected the offer, however, causing A-Train to turn on him and reveal he was the final member of Team Lesnar.