Frieda Petrenko ( ) is a fictional character from the BBC medical drama '' Holby City '' , played by Olga Fedori . She first appears during the twelfth series episode " Together Alone " , originally broadcast on 17 February 2010 . Frieda was introduced as a nurse , before retraining as a foundation doctor . She departs during the fourteenth series episode " Wolf 's Clothing " , originally broadcast on 15 May 2012 . Frieda guest stars in a series 17 episode , originally broadcast on 22 September 2015 , as a patient diagnosed with tuberculosis . Fedori reprised the role again in 2017 and returns in the nineteenth series episode " We Need to Talk About Fredrik " , originally broadcast on 12 December 2017 . The actress quit the role a year later and Frieda departs in the twenty-first series episode " Running " , originally broadcast on 26 March 2019 . The character received critical acclaim and Fedori earned a nomination for Best Newcomer at the 16th National Television Awards
16th National Television Awards
16th National Television Awards
Frieda Petrenko