Petra Kekilli (Victoria Mack) was a villainess from "Flesh and Blood", episode 2.09 of Unforgettable (airdate April 11, 2014). She was a member of the Soviet Union mercenary terrorist group known as the Alpha Five, with Petra and two of her fellow operatives, Sergei Kirsakov and Victor Siyenko, faking their deaths in a plane crash three years prior to the episode's events.
In the events following her faked death, Petra continued her work with the Alpha Five, taking on the alias Estelle and becoming the nanny for children of hedge fund manager Jimmy Serrano, using Serrano's business accounts to further her group's agenda. However, he events of "Flesh and Blood" have Jackie Mikhailova (a former Alpha Five member and Victor's lover) working to trade a flash drive containing a bomb the Alpha Five planted in New York for their son David, who Victor was holding hostage.
After killing Alpha Five member Yevgeni Visov to get the flash drive, Jackie approached Petra in a park where she was with the Serrano children. After sending the children off to play, Jackie teased Petra about her faked death before asking her to tell her where Victor was, offering to let her join her charges if she complied. Despite this, Petra said she couldn't tell her, while callously saying Yevgeni was "sick and weak" when Jackie alluded to the fact that she'd killed him. The evil Petra then got into a brawl with Jackie, eventually trapping her in a headlock as she proclaimed that she wasn't weak. But before Petra could succeed in killing Jackie, she managed to inject Petra with some of the tomexide she kept in her ring, killing her former cohort.
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