A suspicious looking doctor starts doing the rounds at the hospital. The staff hold a surprise party for Mr. Docherty who is getting married the next day.Caroline is shown to be violently vomiting, and later she tells Andrew that she is pregnant.Raj's father is being treated for a heart attack.Dr. Mortimer is diagnosed with pneumonia.Smedley gets back together with Claire.In the final scenes, Dr. Collin visits Liz Reid, who has previously suffered a mental breakdown. Andrew answers the door to what he thinks is a diabetic patient requiring advice, however the patient suddenly stabs Dr. Collin with a needle containing insulin. Raj realises who the man is, and arrives shortly after to bring the maniac under control. In the meantime Maitland, Smedley, Mortimer and Raj attempt to treat Dr. Collin, whose life is clearly in great danger.