There is shock on Keller when doctor Dominic Copeland returns to Holby to retake his first year. Will Arthur forgive him for what he did to Malick? Mo's sister Adele joins AAU as the new healthcare assisstant but will there be trouble between them? Meanwhile Colette discovers Guy cut corners to give her the nursing job and now she must prove herself to somebody from HR.

New registrar Raf Di Lucca arrives on AAU and makes an impression when he takes on a revolutionary procedure. Sacha comes under pressure from Guy to help Zosia make it as a surgeon and Jac struggles to bond with Emma.