Persephone "Penny" Valentine is a fictional character from the BBC medical drama television series Holby City, portrayed by actress Emma Catherwood. She appeared from 2009–11, in the programme's eleventh to thirteenth series. Penny was introduced alongside her younger brother, Oliver (James Anderson), as a Foundation House Officer 1 (F1) on surgical rotation at Holby City Hospital. She eventually progressed to F2 level, before being killed off in the aftermath of a train crash; her death occurring off-screen.