The former star of The Inspector Lynley Mysteries has joined the cast for Series 4 of the BBC One fantasy drama as Arthur’s uncle, Agravaine.

In a new interview with CultBox, Parker teased: “Agravaine is not necessarily a good person. He’s pretty much a baddy. Yeah, he’s a baddy.”

He continued: “I think in mythology terms he was Arthur’s nephew, but we’re playing him as Arthur’s uncle and that brings a presence to the court as Arthur grows older and things happen for him. I become his problem really. I’m a rather dark and mysterious character in the background quite a lot.”

Currently filming in Wales and France, Series 4 is set to air on BBC One this autumn.

> Buy the Series 3 boxset on Amazon.

It was announced at Comic-Con in San Diego over the weekend that the show has been renewed for a fifth series, due to air in 2012.

Watch the full new ‘Original British Drama’ trailer, featuring clips from Series 4…