The game's main antagonist, a traitorous former Rainbow operative revealed as a mole in "Rainbow Six: Vegas". Though cunning and ambitious, Nowak's gung-ho recklessness earns him the disrespect of fellow teammates, ultimately leading to Bishop passing him up for promotion in favor of Logan, which therefore leads to Nowak betraying the Rainbow organization with the assistance of big-time terrorist ringleaders. Nowak betrays more Rainbow operatives in Vegas 2, mainly by posing falsely as an NSA agent, helping Bishop along the way for some of the campaign while actually putting Bishop in a state of danger, in order to kill him/her, which fails. Bishop eventually kills him in a final showdown at a villa in Costa Rica.