ARIN Smethurst has opened up on exactly what's to come in the upcoming special episode of BBC drama Casualty.
The star - who plays Sah Brockner - has revealed plans for the hospital-based series to dive into the relationship between Sah and their colleague, Jan Jennings, played by Di Botcher.
This will be Casualty's first ever improvised episode, and is set to air this weekend (December 10) on BBC One and iPlayer.
It will break from the series' traditional scripted format, focusing on paramedics Jan and Sah, as well as their co-workers Iain and Teddy as they're pushed to breaking point.
The episode follows the paramedics across four days and shows the pressure and obstacles they are faced with on busy shifts.
Jan arrives back from holiday with a spring in her step, but is ground down over the course of her shift and makes a terrible mistake.
Teddy’s (Milo Clarke) confidence is undermined on a difficult call out, and Iain (Michael Stevenson) and Sah both battle with intensely stressful situations.
Speaking to the Express, Arin has detailed what will happen to Jan in the upcoming episode.
They said: "Jan plays a major role in this, she is pushed to the limit and it all comes to a head at one point, which I won't spoil.
"Sah and Jan are paired up and they have a rough four days, and Teddy and Iain are paired up and they also have a rough four days.
"Teddy is having a bit of a confidence crisis as well."
They added: "We explore all that through this journey."
Arin explained that their character Sah is set to "take charge" to ensure that "Jan is okay - which she isn't'."
Speaking more about the improvised element of the upcoming episode, director Steve Hughes said: "The actors improvised all their dialogue and we shot everything like a documentary to give it a grounded, naturalistic feel.
"It was vital to make this episode feel as authentic as possible to highlight the challenges paramedics, and the NHS as a whole, face on a daily basis."
Steve admitted it was "scary" for the actors to improvise at first, comparing it to "walking a tightrope without a net".
However, he added: "it was also freeing and exciting to be able to use their own voices and, even though most of them hadn’t done anything like this before, they all rose to the challenge and I’m so proud of what we achieved.”
