Geronimo! It's been confirmed that Irish actor Liam Cunningham will star in a special 50th anniversary episode of the wildly popular BBC sci-fi drama Doctor Who.

According to IFTN the Game of Thrones star will appear in an episode written by English screenwriter Mark Gatiss, whose credits include two BBC monster hits Doctor Who and Sherlock.

Alongside Cunningham, Emmy Award-winning actor David Warner, Jessica Raine (The Woman In Black) and Scottish actor Dougray Scott (Desperate Housewives) will all make guest appearances in the internationally popular show.

Cunningham was recently confirmed to play a role in the BBC's hit series ‘Merlin’ which is currently shooting season five in Europe.

The in demand Dublin-born actor has a major role as Ser Davos Seaworth in HBO’s Game of Thrones, which is due to begin production on series three in Northern Ireland again next month. The series will return to Belfast’s Paint Hall Studios, where seasons one and two were filmed with the support of Northern Ireland Screen.

Series seven of ‘Doctor Who’ is currently in production since February 2012. Cunningham’s episode will air on BBC One in 2013.

Irish "Game of Thrones" star Liam CunninghamGoogle Images