Ubisoft's smash hit "Assassin's Creed" is an action-adventure RPG that has had nine games to its name and has appeared in every major console in the last decade.

The game focuses on the centuries-old battle between the Assassins, who strive for peace and personal freedom of the individual, and the Templars, who are obsessed in subjugating the world under its heels. The game's scenarios exist in a fictional world but are based on real historical world events.

"Assassin's Creed" is critically acclaimed having sold over 73 million units as of April 2014, making it Ubisoft's best-selling game.

The series was inspired from the novel "Alamut" by Slovenian writer Vladimir Bartol. It also studied "The Prince of Persia" video game series for ideas.

The game's immense popularity has prompted the developers to bring it to the big screen, to the delight of fans.

The upcoming "Assassin's Creed" movie is directed by Justin Kurzel, and has Michael Fassbender, the actor who portrayed Magneto in the recent "X-men" movies, as the lead protagonist.

The film will take place in the world of the video games but will have an original story. The film started shooting in late August 2015 and finished last January 2016.

Now new updates about the much-awaited film just came out, revealing that all the historical flashback sequences in the movie were done in Spanish. This means the actors will be talking in Spanish when the scene shifts from the 21st century to the 15th century Spain.

The "Assassin's Creed" director explained the decision behind using Spanish as the mode of language for the flashback scenes.

"I just love the fact [production company] New Regency embraced it," Kurzel said. "We did play around with English as well, but it was really obvious what you wanted as soon as you went back and started speaking beautiful Spanish. It really adds an exoticness and richness to the film."

The director said that using Spanish will give fans an authentic experience of the world the "Assassins" lived.

The film producers assured fans that the "Assassin's Creed" movie will employ subtitles for the Spanish scenes. There won't be any need to brush up on past Spanish lessons or bring a Spanish-English dictionary in the theater.

"Assassin's Creed" is slated to hit theaters in the U.S. on Dec. 21, just in time for Christmas.