Casualty and Holby were thrown together at Christmas 2004 for a two hour action-packed episode!
Watch part 1 catch-upWatch part 2 catch-up

View sensational photos of the episodes and go behind the scenes with the gallery

So how did the crossover come about? Casualty's Executive Producer, Mervyn Watson reveals all

Relive Casualty's most memorable Xmases with
Classic Clips

View stunning snaps from 2004 with the photo gallery