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.