He was the eldest son to Frank Stallone Sr, a hairdresser, and Jackie Stallone, an astrologer, former dancer and women's wrestling promoter. His younger brother is actor and musician Frank Stallone. Their father was born in Gioia Del Colle, in Apulia, Italy and emigrated to the US as a child. Their mother is half Russian Jewish and half French. Complications his mom had suffered in birth had resulted in doctors having to use 2 pairs of forceps during his birth; because of this, they had severed a nerve and caused paralysis in parts of his face. As a result of this, the lower left side of his face is paralyzed, including parts of his tongue, lip and chin, which give him a trademark he is now known for, slightly slurred speech, and a snarling look.
Most of his early stuff was just cameos in other movies, like the 1971 Woody Allen movie Bananas where he played subway thug, Klute(1971) as an extra dancing in the club, a youth in The Prisoner of Second Avenue, 1974 a starring role in The Lords of Flatbush
On March 24, 1975, Stallone saw the fight between Muhammad Ali and Chuck Wepner, which gave him the inspiration for the movie Rocky. He went home and after 3 days or 20 hours, he came up with the script for Rocky. This movie went on to win various awards, such as Best Directing, Film Editing, Best Picture, Best Actor, Best Screenplay. In the early 1980s, he starred alongside British actor Michael Caine in Escape to Victory(1981), a sports movie where he plays a prisoner of war involved in a Nazi propaganda soccer game. Also that year he starred in the movie Nighthawks, where he played a New York cop named Deak DeSilva, who plays cat and mouse with a foreign terrorist. In the year 1982, he starred in a movie that would be a trademark of his forever. In 1982, he starred as John Rambo, a battle scarred Vietnam vet in the movie First Blood(1982). There were 3 other sequels, Rambo:First Blood pt. II (1985), which had him going to southeast Asia looking for POWs from the Vietnam War, and Rambo III (1988), which had him going to the deserts of Afghanistan to rescue his commander, Col. Trautman(Richard Crenna) and Rambo(2008), in which the now retired soldier is asked by missionaries in Burma to help rescue fellow missionaries trapped by Burmese rebels. During the making of the Rocky movies, Stallone worked out like a madman
In 1992, he tried comedy with Stop! Or My Mom Will Shoot, where he played a police officer named Joe Bomowski who receives a visit from his mother Tutti Bomowski (Estelle Getty). After she buys him an illegal MAC 10 and starts nosing in his police cases, she becomes witness to a murder of the gun dealer she bought the gun from. In 1993, he got back in to action with the movie Cliffhanger, where he played Gabe Walker, a professional mountain climber who plays cat and mouse with a group of thieves, led by professional thief Eric Qualen (John Lithgow), who was a former Military Intelligence member who looks to reclaim $100 million in uncirculated bills from the US Treasury. Later that year, he starred alongside Wesley Snipes in Demolition Man, where he played a cop named John Spartan who goes into cryogenic freezing and is later taken out to get a criminal who escaped. In 1994, he starred as Ray Quick in The Specialist. In this movie, he is a CIA explosives expert who takes a job from a woman named May Munro (Sharon Stone), who wants revenge on the Cuban mobster who killed her parents.
In 2003, he played the role of a villain in the 3rd Spy Kids movie, Spy Kids 3: Game Over named The Toymaker.
2010 and on
In 2010, he starred in The Expendables, alongside Mickey Rourke, Jet Li, Jason Statham, Randy Couture and Steve Austin. Basically the movie is about where he and the rest of the guys are a group of highly trained military mercenaries who have to kill a general in a fictional island town called Vilena.