The daughter of Dominik Cibulka, a Chernorussian assembly-line worker, and Yelena Vetrova, a Russian engineer. Assigned to the same factory while Chernarus was dominated by the Soviet Union shortly after the 2nd World War, Dominik and Yelena fell in love and were wedded in September of 1951. By mid-June, they had given birth to their first child, Yekaterina. From a young age Katya excelled in science and mathematics, but had difficulty socializing. Going on to become a biologist, she immersed herself in her work to the exception of all other pursuits. Never having a family of her own and with few attachments to others, she took the crumbling of society in stride.
At the start of the outbreak she was recruited by the Chernorussian government to help search for a cure to the infection, but made little progress before her lab was overrun. Narrowly escaping with her life and her notes, Katya continues her research on her own. Seeking out facilities and performing experiments on both the infected and the uninfected, the search for a cure has become her sole focus in life.