▁The ▁character ▁is ▁introduced ▁alongside ▁Luke ▁Roberts ▁and ▁Tom ▁Ch amb ers ▁as ▁Joseph ▁By r ne ▁and ▁Sam ▁Stra chan , ▁respectively . ▁Jac ▁is ▁character ised ▁as ▁a ▁highly ▁am bit ious , ▁forth right ▁sur geon ▁who ▁is ▁career - orient ed . ▁Her ▁back story ▁states ▁that ▁her ▁mother ▁placed ▁her ▁in ▁fost er ▁care ▁aged ▁twelve . ▁Jac ▁strugg les ▁to ▁form ▁relationships , ▁but ▁establish es ▁rival ries ▁and ▁uses ▁sexual ▁manip ulation ▁to ▁her ▁benefit , ▁eng aging ▁in ▁roman ces ▁with ▁multiple ▁colle agues . ▁ ▁Marcel ▁took ▁mat ern ity ▁leave ▁in ▁ 2 0 1 4 ▁and ▁Jac ▁tempor arily ▁dep arts ▁in ▁the ▁sevent e enth ▁series ▁episode ▁" Go ▁the ▁Dist ance ", ▁originally ▁broadcast ▁on ▁ 1 4 ▁April ▁ 2 0 1 5 , ▁after ▁re unit ing ▁with ▁Jon ny ▁Ma con ie ▁( Michael ▁Thom son ). ▁Marcel ▁returns ▁for ▁two ▁appearances ▁during ▁her ▁mat ern ity ▁leave , ▁before ▁returning ▁in ▁the ▁eigh teenth ▁series ▁episode ▁" A ▁Del icate ▁Tr uth ", ▁originally ▁broadcast ▁on ▁ 2 4 ▁November ▁ 2 0 1 5 . ▁Marcel ▁worked ▁with ▁produ cers ▁to ▁emphas ise ▁Jac ' s ▁b itch y ▁character isation ▁on ▁her ▁return . ▁After ▁not icing ▁a ▁connection ▁between ▁Marcel ▁and ▁Alex ▁Walk in sh aw , ▁Jac ▁was ▁pa ired ▁with ▁his ▁character , ▁director ▁of ▁n urs ing ▁Ad rian ▁" F let ch " ▁F let cher , ▁in ▁