Alfie Allen says 'Game of Thrones' fans "aren't going to be happy" about upcoming scenes.

John Wick

John Wick

The 28-year-old actor - who plays Theon Lovejoy in the HBO drama - has revealed something is set to happen in the middle of the current fifth series that is going to leave viewers shocked.

He said: "There's something that happens about halfway through this season that is really going to make huge waves, and people aren't going to be happy about it. It's hard to watch.

"I bear witness to this thing, and it's crazy, sort of having to portray how messed up everyone's situation is through my own reactions to what happens. Get ready for it."

The 'John Wick' star also hinted that his co-star Iwan Rheon's character Ramsay Bolton is set to become even more evil, having already flayed men, hunted women and cut off Theon's manhood.

Alfie told the website Zap2it: "I would go so far as to say maybe Ramsay Bolton is the new Joffrey in town, and then probably me followed closely after that."

There will also be a new character joining the 'Game of Thrones' cast who Ramsay "enjoys tormenting", and Alfie teased that it's going to be "tough to watch".

He said: "There's this one character who crosses both of our paths, and [Ramsay] certainly enjoys tormenting this character. It can be tough to watch for some people, without a doubt."