The fourth installment of Rocky.
In this film, Apollo is killed by an incredibly strong Russian named Ivan Drago.
Rocky must avenge his friend so he goes to Russia, and on Christmas Day, gets hit a thousand times and knocked down 10+ times, still, somehow manages to beat the Russian in the 15th and final round.
At the end of the fight, the Soviet crowd cheers on Rocky...that part probably ruins any idea of realism in the story.
Nonetheless, Rocky IV is a cold war masterpiece, and for Rocky fans, the training montages and the final fight are the best in the series.
" Rocky IV is MUCH better than Rocky V "