The actor told The Times he has gone for the role of a slave who leads a rebellion "like Spartacus".He said: "Every scene is a bloodbath. Frankly I think I'm cut out for that."Allen also revealed he had previously auditioned for the part of his son's on-screen father but said he deliberately failed the screen test.He told The Times the offer was "a bit cheesy, a bit obvious" so he "did a rubbish audition".The epic fantasy series, which is partly filmed in Northern Ireland, is currently on its fourth season.Alfie Allen, who plays Theon Greyjoy in the show, has appeared in every series.The show could have been even more of a family affair after Allen's sister Lily was approached to play his on-screen sibling Yara.She told fans she turned down the role because she "felt uncomfortable" with the storyline between the pair.Alfie Allen later denied his sister's claim about the role.He told entertainment website Vulture: "I heard about this, yeah. The only thing I'm going to say on that is that it's not true."Other famous faces in the current cast include Lena Headey, Charles Dance, Aidan Gillen and Diana Rigg.