BBC One medical drama Casualty has released first-look photos from its Christmas special, billed as a "format-breaking standalone episode".
Teeing up what's ahead in All I Want for Christmas, the BBC said: "Made in Cardiff by BBC Studios Drama Productions, this innovative new special is a tribute to the miracle of blood, brought to life with all the tension and emotional depth that Casualty delivers so well.
"It's Christmas Day in the ED and the team are faced with an emergency blood shortage. Whilst Stevie (Elinor Lawless) fights to save lives, Iain (Michael Stevenson) risks his own to ensure the hospital doesn't go without.
"The special will guest star Lucy-Jo Hudson (Wild at Heart, Doctors), Tristan Sturrock (Poldark, The Crown), Joseph Charles (Breathtaking, Solo: A Star Wars Story), Zoe Brough (Outrageous, Father Brown), Katy Carmichael (Malpractice, Spaced), and Valerie Antwi (DI Ray, Harry Potter and the Cursed Child) who join the beloved Casualty regulars."
"All I Want for Christmas will also feature real-life testimonies from contributors who've been directly impacted by UK blood donation, as well as interviews with key workers who form the country's blood service," the BBC added.
A new series of Casualty - "the world's longest-running primetime medical drama" - will begin on BBC One later in December.
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