Callum Keith Rennie's talent at portraying compelling and dark characters continued on "24." For three episodes in Season 8, Rennie played the role of Vladimir Laitanan, an illegal weapons trafficker for a Russian crime syndicate. Unlike some of his previous roles, there is no moral gray area for Vladimir: The weapons dealer is an unequivocal villain as his interactions with the CTU make clear.

Jack Bauer (Kiefer Sutherland) — in an attempt to track down nuclear weapons meant to be used against the president — joins former FBI agent Renee Walker (Annie Wersching) who six years prior had gone under cover to disrupt Vladimir's operation. Vladimir had become obsessed with her and attempted to assault her. When they meet again, Renee attempts to use his twisted affection for her to their advantage and goes undercover again to get close to the weapons. Ultimately, Vladimir's obsession is his downfall. He is so blinded by his attraction to Renee that he never guesses her true intentions. When he reneges on their deal, Renee lashes back after all the torment she has suffered because of him, and kills him. Vladimir's time on "24" may have been short but his talent at portraying insidious characters is undeniable.

If you or anyone you know has been a victim of sexual assault, help is available. Visit the Rape, Abuse & Incest National Network website or contact RAINN's National Helpline at 1-800-656-HOPE (4673).