Departing Coronation Street star Michelle Collins is to guest star in Casualty episodes across the summer.
Her character, Samantha, will begin a relationship with paramedic Jeff (Matt Bardock), with the makers of the hospital drama revealing that Samantha has a secret which will "turn both their worlds upside down".
Collins said: "I got offered the guest role in Casualty very soon after finishing Corrie. I jumped at the chance of playing a character so different so quickly; it was exciting to be stepping into something new.
"Playing Stella [in Coronation Street] was great fun, but it was thrilling to have a challenge of an entirely different role. Londoner Samantha is nothing like Stella."
Casualty's Executive Producer, Oliver Kent, added: "We can't wait for everyone to meet Samantha and see where her story goes over the two months she's on screen.
"Michelle has been absolutely brilliant and her arrival is set to have a huge impact on one of the show's most loved characters."
Collins' final Coronation Street scenes will air next week.