20th Century Fox is developing a sequel to this year's hit action-thriller Kingsman: The Secret Service. The movie, which is adapted from Mark Millar's comic book of the same name, just passed the $400 million mark at the global box office, earning $126.5 million domestically and $274.4 million internationally. Kingsman: The Secret Service opened the same day as the highly-anticipated Fifty Shades of Grey, but it held its own, earning an impressive $41 million on opening weekend. Be warned, if you haven't seen Kingsman: The Secret Service yet, there will be some SPOILERS below.

Just a few days after Kingsman: The Secret Service opened, director Matthew Vaughn revealed in a February interview that he is working on ideas for the sequel, which may include Colin Firth's Harry Hart, even though he was killed by the nefarious Valentine (Samuel L. Jackson) towards the end of Kingsman: The Secret Service. The filmmaker, who also wrote the adapted screenplay with his wife Jane Goldman, said that, whether or not Harry Hart comes back, the sequel will focus on Harry's nephew, Eggsy (Taron Egerton), who becomes the "modern-day gentleman spy." It isn't known if other cast members such as Sofia Boutella, Mark Strong, Sophie Cookson and Michael Caine will be back for the follow-up.

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With that being said, it isn't known for certain if Matthew Vaughn will direct Kingsman 2 or not, or if he will once again write the script with Jane Goldman. The director has a number of other projects currently on his plate, with a Flash Gordon remake, The Golden Age and American Jesus currently in development. He is also producing Eddie the Eagle, a biopic centering on the U.K.'s first ever Olympic ski jumper, Eddie 'The Eagle' Edwards, who is portrayed by Kingsman: The Secret Service star Taron Egerton.