Games of Thrones will add Mark Gatiss, the British renaissance man who’s both written and acted in cult classic Doctor Who and created and starred in Sherlock.

Though Game of Thrones creators have let slip that Gatiss is joining the enormous all-star cast of the hit HBO medieval fantasy series, they’re tightlipped about who he will play. Since Game of Thrones is based on George R.R. Martin’s best-selling The Song of Fire and Ice book series, fans are eager to place the actor’s face to a much-beloved or much-despised character from the novels.

Another actor being welcomed in to the Game of Thrones fold for its fourth season is Chilean actor Pedro Pascal. Pascal will play the pivotal part of Prince Oberyn “The Red Viper” Martell. In the books, Martel is described as a virile man quick to bloody and quick to bed whomever he so chooses. In season four, he'll be headed to King's Landing for the royal wedding and liable to cause some trouble.

Martin previously confirmed that, in addition to the Red Viper, season four of Game of Thrones would also include the father of Joffrey’s (Jack Gleeson) betrothed Margaery (Natalie Dormer), Mace Tyrell, and the Wildling leader Magnar of Thenn. Gatiss could play either of them, but he seems a more likely fit for the good-natured son of Highgarden’s Lady Oleanna.

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