Rogue One: A Star Wars Story is currently in production, but it seems one actor, Mads Mikkelsen, took a break over the holiday weekend to attend Fan Expo Canada in Toronto. There he signed a poster for fan J.J. Good, where he revealed his character's name is "Galen" under the signature. The poster was also signed by Star Wars: Episode II - Attack of the Clones actor Zachariah Jensen, also signed the poster in the same format, with his autograph above his character's name, Kit Fisto. The big question that remains is, who is Galen?
Some fans have speculated already that Galen could be Galen Marek from the popular video game, Star Wars: The Force Unleashed. The character was best known by his call sign, Starkiller, as an homage to Luke Skywalker's original name in Star Wars: Episode IV - A New Hope. If Mads Mikkelsen is in fact playing Galen Marek, this reveal could have interesting implications.
In the Force Unleashed video game, Starkiller was the secret apprentice to Darth Vader, who went on to become instrumental in the formation of the Rebel Alliance, after uniting several of the Empire's enemies. It's worth noting that 37-year-old Sam Witwer provided the voice for Galen Marek in the game, and Mads Mikkelsen is 12 years older than the voice actor, so it's equally possible that Mads Mikkelsen is paying a different Galen entirely in Rogue One. After all, Galen was part of the Expanded Universe, which LucasFilm has confirmed is not part of the Star Wars canon.
Then again, Darth Vader has been rumored to appear in Rogue One: A Star Wars Story, not as the main villain, but appearing either through a hologram or a view screen. Ben Mendelsohn is rumored to be playing the main villain, who, if this rumor is true, will be working under Lord Vader. Mads Mikkelsen himself recently revealed that he is not playing a villain, although he does have an important role.
With all of that being said, do you think Mads Mikkelsen is actually playing Galen Marek in Rogue One: A Star Wars Story? There have been a number of other characters named Galen that appeared throughout the Expanded Universe, but since those stories aren't part of the official Star Wars canon, it seems unlikely that we will see Galen Marek in Rogue One: A Star Wars Story. While we wait for new details, check out the photo from J.J. Good's Twitter account, featuring Mads Mikkelsen's autograph.