When "Game of Thrones" stars book movie roles, it's usually understood that they'll film during a couple of months of the HBO show's off-season. But TV roles? Most shows take several months to shoot, especially network series in the U.S. that can include 22-24 episodes, filming for most of the year. So when a GoT star books a new TV role it's understandable to think that might bode ill for the GoT character.

However, that may not be the case for new "Peaky Blinders" star Aidan Gillen. He plays Petyr Baelish/Littlefinger in "Game of Thrones," and Deadline recently revealed that he had joined the cast of "Peaky Blinders" Season 4, which just began shooting in Liverpool, England. There's no word yet on his character, or if he could continue into Season 5, which is already official.

The good news is that, if "Peaky" Season 4 just started filming in March, and it's only expected to shoot for about four months, it shouldn't conflict with "Game of Thrones" Season 8 filming at all. GoT Season 7 finished filming in February and isn't expected to start Season 8 filming until September.

That said, if "Peaky" Season 5 follows the filming schedule of its third season, and Gillen is still on the show, that could pose a conflict. According to the Birmingham Mail of the U.K., Season 3 started filming in the fall of 2015 and took four months to film, finishing at the end of January. If Season 5 does the same, it's hard to see how Gillen could also film the final season of "Game of Thrones."

But we'll have to wait and see on that. U.S. viewers can watch "Peaky Blinders" on Netflix, and Season 4 is expected to drop sometime in late 2017. "Game of Thrones" Season 7, which last showed Littlefinger at Winterfell with Jon Snow and Sansa Stark, premieres July 16 on HBO.

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