Downton Abbey's Tom Cullen is the latest star sign on for the BBC's upcoming drama series about the Gunpowder Plot.

Joining the likes of Game of Thrones' Kit Harington, Sherlock's Mark Gatiss and Lord of the Rings' Liv Tyler, Tom will reportedly take on the role of none other than Guy Fawkes himself.

According to the Radio Times, Cullen - who played Lady Mary's unsuccessful suitor Viscount Gillingham in Downton - is gearing up to play one of Britain's most notorious (and failed) villains.

Gunpowder is set to be an explosive (geddit?) three-part series following the buildup to the Gunpowder Plot, the band of rogues who planned to carry it out, and the challenges they faced in making it (not) happen.

Fred Duval / Getty Images

(Mark Gatiss)

Related: Kit Harington, Mark Gatiss and Liv Tyler will star in an explosive BBC One thriller about the Gunpowder Plot

Harington has been confirmed in the role of Robert Catesby, the mastermind behind the whole thing, while Gatiss will take on spymaster Robert Cecil and Tyler will play Catesby's suspicious cousin.

Also reported to have joined the ever-growing cast are Broadchurch's Shaun Dooley, Wolf Hall's Edward Holcroft and EastEnders' Sian Webber.

While filming is rumoured to begin any day now, no official premiere date has been confirmed. Although, let's face it, there's only really one date it can be. November 5, anyone?

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