One fan took to Reddit to figure it out, with Caroline Harker, 58, quickly revealed. They asked on the discussion forum website: 'Who played the white-haired Dr Todd in tonight's episode?' ...

They soon discovered that she was none other than Caroline Harker, who'd once been a major player in crime drama Touch of Frost. She played Hazel in the series, which had run between 1992 and 2010.

Caroline Harker (born 1966) is an English stage and television actress, sister of actress Susannah Harker, and daughter of actors Polly Adams and Richard Owens. She is known for her roles as Celia ...

Taking to social media, viewers were left distracted as they recognised Dr Caitlin star Caroline Harker. One person said: "Ok so who knows where I've seen her from?", a different account put ...

The medic, who made her debut in a dramatic A&E scene with Jacob Gallagher (played by Joe Warren Plant), is portrayed by actress Caroline Harker. Fans quickly realised they'd seen her before ...

A group of children all share one dream, to set up their very own theatre company. Pamela Brown's adventure stars James Lance and Caroline Harker ...