The trailer for Netflix's upcoming Sylvester Stallone documentary just dropped. The project titled 'Sly' follows Stallone's 50-year career in Hollywood. The official description reads, "From 'Rocky' to 'Rambo' to 'The Expendables', this retrospective documentary offers an intimate look at the Oscar-nominated actor-writer-director-producer, paralleling his inspirational underdog-story with the indelible characters he has brought to life."