The first film, Fifty Shades of Grey, was released on February 13, 2015, while the second, Fifty Shades Darker, was released on February 10, 2017. Fifty Shades Freed, the third film, was released on February 9, 2018. Worldwide, the series has grossed over $1.320 billion, making it the fourth highest-grossing R-rated franchise of all-time.

What is the sequel of fifty shades of grey? OK. Let's think. My stream of consciousness:
The relevant information to answer the above question is: The first film, Fifty Shades of Grey, was released on February 13, 2015, while the second, Fifty Shades Darker, was released on February 10, 2017. The answer is Fifty Shades Darker.