• Alfie Allen plays Theon Garyon in the HBO series "Game of Thrones."

Alfie Allen plays Theon Garyon in the HBO series "Game of Thrones." (Photo : Instagram/Alfie Allen)

Known as one of Kit Harington's "Game of Thrones" co-actors, Alfie Allen was one of the actors Danny Boyle brought together to perform for an African children's charity show in London.

"I've never been on stage at the Royal Court before," Allen told Belfast Telegraph. "Just to be on the stage here, it's such an amazing theatre and around a fantastic cause."

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For Allen, starring in "Children's Monologues" at Royal Court Theatre in London is an incredible opportunity since he got to co-star with respectable actors including "Harry Potter" actor David Thewlis.

According to Allen, Thewlis is just great and he is someone he has always looked up to as an actor for a long time. He added that he was just really glad that he got to be on the same stage as the "Harry Potter" actor was on the same night.

Thewlis played Remus Lupin in "Harry Potter and the Prisoner of Azkaban," "Harry Potter and the Order of the Phoeneiz," "Harry Potter and the Half-Blood Prince," "Harry Potter and the Deathly Hallows: Part 1" and "Harry Potter and the Deathly Hallows: Part 2."

Allen revealed that he was so excited about his performance at London's at Royal Court Theatre that he left his keys in his flat. He said, "As soon as I got the call I was so excited for it. The things which happen in South Africa are awful."

About his piece, Allen said it was a gang-rape scene adapted from the original testimony by Neil LaBute. He described it as a dark piece about initiation into a gang.

Allen is set to reprise his role as Theon Greyjoy in "Game of Thrones" season 6 while speculations that Jon Snow is still alive are still mere rumors.

In September, Harington was spotted on the set of "Game of Thrones" season 6 but whether or not he was reprising his role as Jon Snow has yet to be confirmed. But the actor told Belgian magazine Humo that the HBO series will remain a part of his life for a while.