The guest cast for a major BBC crime drama has been revealed.

Acclaimed actors Ian Hart and Vincent Regan have been announced as the lead guest cast for the popular BBC drama Shetland as filming begins for the new series.

Hart is known for featuring in Mr Bates Vs The Post Office, Harry Potter, and The Responder, while Regan is known for starring in Traces, Luther, The Fallen Sun, and Aquaman.

The pair will join series favourites Ashley Jensen and Alison O'Donnell for the new series.

Glasgow Times: Alison O’Donnell & Ashley JensenAlison O’Donnell & Ashley Jensen (Image: Supplied)

On top of that, other guest cast starring in the forthcoming series include Stuart Campbell, Robert Jack, Nalini Chetty, Jimmy Yuill, and Lesley Hart.

All the guest cast will star alongside series regulars including Steven Robertson, Lewis Howden, Anne Kidd, Angus Miller, Steven Miller, Tibu Fortes, Conor McCarry, and Eubha Akilade.

The show will be filmed across locations in Scotland and on the Shetland Isles over the coming months, with the series debuting on BBC One and BBC iPlayer later this year.

Originally based on award-winning novels by crime writer Ann Cleeves, the new six-part series sees DI Calder (Jensen) - now a resident of the Isles - thrown in at the deep end after a friend of Tosh's (O'Donnell) goes missing.

The chilling tale of 'disappearance and death' sparks a 'labyrinthine investigation' for Tosh and Calder that challenges the line between personal and professional.

The new series of Shetland will be written by lead writers Paul Logue and Denise Paul.

Ian Hart says: I’m looking forward to embarking on a Shetland adventure – it’s a place I’ve always wanted to visit and to do so with this incredible drama is wonderful.”

Vincent Regan says: “I’m thrilled to be joining the cast of Shetland which is such a beloved BBC drama.

"My character and his family are at the heart of this dark and twisting storyline and I’m looking forward to seeing how it all unfolds.

"The opportunity to visit the Shetland Isles was also a real pull to the part as well as working with the likes of Ashley Jensen and Alison O’Donnell.”