Catherine Russell To Exit BBC One’s ‘Holby City’
Catherine Russell, who has played Serena Campbell since 2012, is exiting BBC One's Holby City. She is poised to leave the BBC Studios produced show with a "heroic exit" in the New Year. Per the BBC, Serena will face a dark reminder from the past and then developments at the hospital will bring out her joyously rebellious side as she passionately fights for her family and her most cherished values. 
Jo Martin (Fleabag, The Long Song, Silent Witness) has joined the cast of BBC One's long-running medical drama Holby City. Jo has already started in the role and her first appearance will air this autumn. “I am thrilled to be joining such an amazing show, which I have been a fan of for years", Jo Martin said in a statement. "Playing Max will be a pleasure; she is very complex with no filter.”