Details of the Casualty Christmas special have revealed the staff at Holby City Hospital will be facing a blood shortage crisis in tense scenes. The festive special of the long-running BBC medical drama is due to air on Saturday night, ahead of Christmas , which this year lands on Wednesday. And the the full fifty minute special, which has the title Casualty: All I Want for Christmas, will explore the consequences of a blood shortage as one young patient is found to need a transfusion. The