Peter Farrelly to direct "I Play Rocky," a biopic about Sylvester Stallone's struggle to play Rocky.

Peter Farrelly, director of "Green Book," is set to direct "I Play Rocky," a biopic about Sylvester Stallone's determination to play the iconic role of Rocky, focusing on his personal struggles as a partially paralyzed and speech-impeded actor fighting to secure the lead role in the original film. Peter Gamble wrote the script, and casting is underway. The movie is expected to explore Stallone's journey to create the box-office hit "Rocky" in 1976.