Mayhem 1999 features a tournament to crown the new WCW World Heavyweight Champion. Participants include Bret Hart, Sting, Jeff Jarrett, and more. Goldberg faces Sid Vicious in an "I Quit" Match. Scott Hall battles Booker T with both the United States and Television Championships on the line.
| Actor | Role |
|---|---|
 Bret HartBret Hart | Bret Hart |
 Steve BordenSting | Sting |
 Chris BenoitChris Benoit | Chris Benoit |
 Jeffrey JarrettJeff Jarrett | Jeff Jarrett |
 Sid EudySid Vicious | Sid Vicious |
 Bill GoldbergGoldberg | Goldberg |
 Scott HallScott Hall | Scott Hall |
 Booker Huffman, Jr.Booker T | Booker T |
 Larry PfohlThe Total Package | The Total Package |
 Tonga FifitaMeng | Meng |
 Alex WrightBerlyn | Berlyn |
 Ian HodgkinsonVampiro | Vampiro |
 Curt HennigCurt Hennig | Curt Hennig |
 Marcus BagwellBuff Bagwell | Buff Bagwell |
 Perry SatulloPerry Saturn | Perry Saturn |
 Dean SimonDean Malenko | Dean Malenko |
 Christi WolfAsya | Asya |
 Eddie GuerreroEddie Guerrero | Eddie Guerrero |
 Peter Gruner Jr.Billy Kidman | Billy Kidman |
 Torrie WilsonTorrie Wilson | Torrie Wilson |
 Norman SmileyNorman Smiley | Norman Smiley |
 Brian YandrisovitzBrian Knobbs | Brian Knobbs |
 Evan KaragiasEvan Karagias | Evan Karagias |
 Glenn GilberttiDisco Inferno | Disco Inferno |
 Charles AshenoffKonnan | Konnan |
 Troy MartinShane Douglas | Shane Douglas |
 Jimmy HartJimmy Hart | Jimmy Hart |
 Ron HarrisGerald | Gerald |
 Don HarrisPatrick | Patrick |
 Charles SpencerTony Marinara | Tony Marinara |