50 Cent is producing a new docuseries covering a wide range of celebs ... and the most interesting story on the docket is the rise and fall of Tekashi 6ix9ine.
Production sources tell TMZ ... Fiddy's scripted series will focus on Tekashi, Snoop Dogg, music producer Scott Storch, former NBA stud Rafer Alston and 50 himself.
The docuseries is called "A Moment in Time" ... and it will have 6 to 8 hour-long episodes dedicated to each subject.
Our sources say 50 is framing Tekashi's story around his brief but controversial rap career.