| Himself | Lamon Brewster | |
| Himself | Chris Byrd | |
| Himself | Bernd B?nte | |
| Himself (as Dr. Pearlman Hicks) | Pearlman Hicks | |
| Himself (archive footage) | Don King
 | |
| Herself | Nadeshda Uljanowna Klitschko | |
| Herself | Natalia Klitschko | |
| Himself | Vitali Klitschko | |
| Himself | Vladimir Klitschko | |
| Himself | Klaus-Peter Kohl | |
| Himself | 伦洛克斯·刘易斯
 | |
| Himself (archive footage) | Henry Maske | |
| Himself | Larry Merchant | |
| Himself | Falk Nebiger | |
| Herself (archive footage) | 海顿·潘妮蒂尔
 | |
| Himself | Dan Rafael | |
| Himself | Hartmut Scherzer | |
| Himself | Andrej Schistow | |
| Himself | Fritz Sdunek | |
| Herself | Anna Starostenko | |
| Himself | Emanuel Steward | |
| Himself | Wladimir Zolotarew | |
