The movie tells the legendary tale of an uneducated but kind-hearted debt collector for a loan shark in the city of Philadelphia. Rocky starts out as a club fighter who later gets a shot at the world heavyweight championship.
The main plot is rumored to have been based on the real life boxing match between Muhammad Ali and Chuck Wepner at Richfield Coliseum in Richfield, Ohio on March 24, 1975. Stallone reportedly watched the fight and shortly afterwards wrote the script for this epic sports drama classic.
Interestingly enough, the film had a budget of only $1 million and was shot in 28 days. It later ended up earning $225 million in global box office receipts becoming the highest grossing film of 1976 and went on to win three Oscars, including Best Picture.