Casualty: Season 21, Episode 1

21 - 1: Different Worlds: Part 1

In this special double-bill, marking Casualty's 20th anniversary, action takes place both in Holby and Cambodia, where Duffy has set up a clinic. Charlie, Guppy, Abs and Comfort head to Cambodia to help out Duffy. When a young boy asks for help with his sick father, it sparks a chain of events that put Guppy's surgical skills to the test and prompt Charlie to raise suspicions about the clinic's surgeon, Mike. Meanwhile, back in England, Maggie and Harry are learning to work with a new doctor on exchange from Cambodia. When a young man is brought in, suffering from an overdose, a call from Cambodia forces Harry to make a decision that will have fatal consequences. As tensions run high in Holby, things take a turn for the worse when a bus full of schoolchildren crashes and topples over.