Raising the temperature.
He is one of three dashing new doctors to join the Emergency Department of Holby and set pulses racing a little faster.
Raymond plays anaesthetist Matt Strong, whose bedside manner turns the head of Zoe (Sunetra Sarker), while Robert Boulter is junior doctor Kieron who melts ice queen May (Laura Aikman) but is hiding a big secret.
Finally, acclaimed actor Michael Maloney plays consultant Howard Fairfax, whose surgical savvy impresses the high-maintenance Ruth (Georgia Taylor).
Raymond, who played snobby restaurant maitre d' James Schofield in Hotel Babylon, says: "Joining an established, long-running show like Casualty can be daunting. "I play nice guy Matt who's got a big crush on Zoe and has a great bedside manner. He's warm, funny and easygoing - many of the attributes that Zoe seems to struggle with herself - and seems to be just what she needs in her life. But things accelerate very quickly between them and soon Matt is throwing caution to the wind.
"Luckily I didn't have to cope with a lot of medical jargon or blood and gore. This was just as well as a friend of mine had a dream that on my first day of filming I had to say the line: 'Hello, I'm Matt Strong and I'm an anaesthetist.' He dreamt I had trouble saying it and after the 30th take he woke up laughing!" Robert was less fortunate, as he was thrust right into the medical action.
"One of my first scenes consisted of three pages of words I never even knew existed!" he smiles.
"Kieron has his own agenda and is willing to go to great lengths to get what he wants, which means he's going to have a very big impact on the ED."
Casualty, BBC1, Saturday, 8.50pm