Peter Davison will regenerate in the Caribbean after he signed up to make a guest appearance in Death In Paradise.
The former Doctor Who star is joined in the new series by Helen Baxendale and former EastEnder Michelle Ryan, who are also making guest appearances in the tropical BBC cop show.
Michelle, who played Zoe Slater in the BBC soap, said: "It's very exciting to be a part of this excellent series. I play an actress who is quite a handful with a dark past. The action element is always appealing for me and getting to film on the gorgeous Island of Guadeloupe was incredible. We had so much fun."
The new series sees My Family star Kris Marshall join the show and take over from Ben Miller in the lead role.
BBC bosses have kept tight-lipped about how and exactly when Ben's character, DI Richard Poole, will exit the show, but Kris will play the new lead detective, DI Humphrey Goodman.
Executive producer Belinda Campbell said: "We're thrilled to have another fantastic list of talented guest stars involved for the third series of Death In Paradise.
"We're very lucky to have such gifted actors and actresses to accompany our equally brilliant regular cast in bringing the twists and turns on the intricate mysteries to life. Hopefully the new series will help bring some Caribbean sunshine to the UK during the cold and rainy winter months."