Strong-minded, forthright, highly ambitious consultant at Holby City hospital, whom demonstrates a willingness to flout rules and endanger patients to advance her own career and is willing to hurt others to achieve her own goals. Jac Naylor can sometimes be Holby City's most hated character. She has had many roles in the series, including general surgical registrar from 2005 until 2008 (and again from 2010 until 2011); a cardiothoracic registrar from 2008 until 2009 (and again in 2011), locum consultant general surgeon in 2011, consultant cardiothoracic surgeon starting from 2011 and clinical lead of Darwin ward starting from 2014.