Casualty spoilers follow.

Casualty has released a trailer for its Christmas special, teasing danger for Iain Dean as he helps the hospital deal with an emergency blood shortage.

Titled ‘All I Want for Christmas’, the format-breaking special will see the A&E staff led by Stevie Nash (Elinor Lawless) saving lives on Christmas Day, while paramedic Iain risks his own to ensure the hospital have enough blood.

In the clip (which you can watch at the top of the article), Iain is driving an ambulance, presumably to get blood donations to Holby City Hospital. In a dramatic turn, he appears to lose control of the vehicle on the snowy roads, with the vehicle then flipping onto its roof.

BBC

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As his fate hangs in the balance, Casualty promises an emotional Christmas special.

The episode will also see a number of guest stars crossing paths at Holby City Hospital, including former Hollyoaks star Lucy-Jo Hudson as Adele Thompson, a young mum who brings her seven-year-old daughter to the ED with worrying symptoms.

The Crown‘s Tristan Sturrock portrays Dominic Ryder, a new patient with unresolved emotional trauma, alongside Katy Carmichael as his ex-wife and mother to their two children.

James Pardon//BBC

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Cast for ‘All I Want for Christmas’ is rounded out by DI Ray star Valerie Antwi as Issa Reid, Solo: A Star Wars Story‘s Joseph Charles, and Zoe Brough as the daughter of Faith Cadogan (Kirsty Mitchell).

The episode will be focused on the importance of blood service, incorporating real-life testimonies from contributors who’ve been directly impacted by blood donation in the UK, as well as interviews with key workers.

The Casualty Christmas special will become available to stream on BBC iPlayer from 6am on December 21 and will air on BBC One at 9.20pm on the same day.