Watch Sly (2023) HD Full Movie Free on SolarMovie. Watch Sly (2023) online free. The nearly fifty year prolific career of Sylvester Stallone, who has entertained millions, is seen i...The nearly fifty year prolific career of Sylvester Stallone, who has entertained millions, is seen in retrospective in an intimate look of the actor, writer, director-producer, paralleling with his inspirational life story.