Flowers for Algernon
On May 14, 2013, Rob McElhenney revealed that "Game of Thrones" series creators David Benioff and D. B. Weiss guest-wrote an episode of the ninth season. Charlie Day revealed it would be a "Flowers for Algernon" type of story about "Charlie getting smarter" in a "Limitless" style, and is called "Flowers for Charlie".