Guppy steals Stitch's supply of cocaine after being refused any more, in this week's visit to Holby. Inadvertently, he administers a lethal dose of anaesthetic to a patient. However, Stitch, feeling responsible for his protégé's decline, shoulders the blame.
Selena, meanwhile, steps in front of Harry and saves him from a patient brandishing a gun. Will she recover from her serious wound?
Guppy is played by Elyes Gabel, Stitch by Peter O'Brien, Selena by Liz Carling and Harry by Simon MacCorkindale.