Lenny is determined to track down the last of the drugs trial patients – troubled teen Johnny – and save him from the Crypto virus. After causing an explosion in an office block, wayward Johnny is brought into the ED with his long-suffering mother, Louise, and Lenny leaps on the case.
Despite warnings from his colleagues, Lenny performs a complex life-saving procedure unsupervised, much to Jordan's disapproval. But once Johnny's condition has stabilised, can Louise and the ED team get to the bottom of his behavioural problems?
Meanwhile, middle-aged Mick is brought into the ED after having a nasty fall and seizures. He has a pacemaker, a secret he's keen to keep from his lively young wife, Emma. Could his determination to keep up with his young partner be compromising his health? And just what is causing those seizures?
Charlie makes yet another attempt to reform Shona but, when faced with temptation, Shona buckles and steals from a patient. At his wit's end, Charlie decides to get tough with the teen. Alerting the police, he watches sadly as she's taken away in handcuffs.
Elsewhere, unaware that Zoe is reacting badly to the fertility treatment, Jordan assumes she's suffering from morning sickness.
When Zoe's pregnancy test comes back negative, she tries to tell Jordan the truth but he's so excited he won't let her finish. Unable to crush his joy, Zoe keeps quiet. But how long can she keep up the pretence?