Tom Wlaschiha has dropped hints about his role on HBO's Game of Thrones.

The German star will appear in the second season of the fantasy drama as Jagen H'ghar, a magical assassin.

"He mainly interacts with Arya (Maisie Williams), the little Stark girl, and he is a teacher," Wlaschiha told TeenFirst.

"What I liked about that character is that at the beginning he appears as one of the bad guys, because he is introduced as an assassin. But he turns out to be more her teacher and helps her to kill off her enemies."

The Christopher and His Kind actor also described working on Game of Thrones as "a huge enterprise".

"It was a totally different type of production, but it was good fun," he said. "You had 200 extras on horses every day on location."

Natalie Dormer, Carice van Houten, Stephen Dillane, Liam Cunningham and Hannah Murray are among the other actors to have signed up for roles on Game of Thrones.

Dog Soldiers director Neil Marshall will helm an episode for the second season, as will The Pacific's David Nutter, Rubicon's Alik Sakharov and Boardwalk Empire's David Petrarca.

Game of Thrones will return to HBO in the US and Sky Atlantic in the UK later this year.