Ivan Drago

Drago's trainers, Sergei Igor Rimsky (George Rogan) and Manuel Vega (James "Cannonball" Green), along with his wife Ludmilla (Brigitte Nielsen), are convinced that he can defeat any boxer. Drago enters professional heavyweight boxing in the beginning of the movie.

Former champion Apollo Creed (Carl Weathers), now 43 years old, comes out of retirement to challenge Drago to an exhibition match, promoted by Creed's former rival Rocky Balboa (Sylvester Stallone). Creed arrives to the ring wearing his signature Stars & Stripes boxing garb to "Living in America," sung by James Brown, dancing upon a huge stage that is lowered into the ring. Before the match begins, Drago mutters "You will lose."

At the beginning of the fight, a confident Apollo gives Drago a couple of punches while dancing around the Soviet boxer. But then Drago connects with violent punches and from then, Apollo is no match for the Russian fighter. Drago even continues to attack Creed after the bell is rung to end the round, despite this being an exhibition match instead of a professional one. In Apollo's corner, Rocky contemplates whether to throw in the towel and surrender the fight (against Creed's earlier instructions), but instead he decides to hold onto the towel. Defenseless, Apollo continues to absorb blows to the head until Drago finally kills him with a final blow to the head.

Drago exhibits no remorse about what happened to the former champion, simply stating in an interview after the fight that "if he dies, he dies." To avenge Apollo's death, Rocky travels to the Soviet Union to fight Drago on his home turf in Moscow. The fight eventually becomes a long, drawn-out war between Rocky and Drago, and to everyone's shock, Rocky manages to severely damage Drago, and the crowd begins to cheer for Rocky, whereas at the start of the fight, they were hostile to him. Drago's trainer—a Soviet/East German official—insults him, claiming that by allowing an American to fight so admirably on Russian soil, Drago is disgracing the Soviet Union. The enraged Drago grabs him by the throat, throws him out of the ring, and proclaims he only fights for himself. Immediately preceding the final round, Rocky and Drago meet in the center of the ring where the two men touch gloves as Drago says to Rocky, "To the end." Rocky defeats Drago by KO in the 15th and final round in a dramatic ending.

It is revealed that the pain Drago inflicted on Rocky left Rocky with brain damage (specifically diagnosed as cavum septi pellucidi (CSP)), causing him to mistake people, see visions and various other things. During Rocky's fight with Tommy Gunn, Rocky sees visions of Drago killing Apollo while believing he is about to suffer the same fate at Tommy's hands, until a vision of Mickey inspired him to get up and defeat Tommy.

After his loss to Rocky, Drago was disgraced by the USSR and Ludmilla left him to raise their son, Viktor, on his own. Following the end of the Cold War, Drago was forced to move to Ukraine, where he lived a modest life while relentlessly training Viktor to be an even more formidable boxer than he was. After Viktor knocks out every opponent he faces in Ukraine, and Adonis "Donnie" Creed wins the World Heavyweight Championship, Drago, Viktor, and promoter Buddy Marcelle travel to Philadelphia to issue a challenge to Donnie for the title. Drago visits Rocky in his restaurant to tell him how Rocky cost him everything, and threatens to avenge his loss through Viktor, telling Rocky, "My son will break your boy."

After Donnie accepts the fight and Rocky refuses to train him, Drago intensifies Viktor's training regimen adding weighted chin ups, and battle rope push ups. During the weigh in, Drago taunts Donnie, telling him he is much smaller than Apollo was. Donnie shoves Drago and a scrum breaks out between the two champs.

Viktor pummels Donnie, breaking his ribs and brutally injuring his kidneys, but is disqualified for landing a punch on Donnie while he was down. With Donnie injured and his confidence shattered, Viktor ascends to the top of the boxing world thanks to his unmatched power punches, and Drago's good standing with Russia is partially restored. Ludmilla appears during a dinner meeting, causing Viktor to storm out in disgust. He scolds Drago for seeking validation from the very people who turned their backs on him when he needed them.

Still lacking a true championship belt, the Dragos challenge Donnie to a rematch in Russia. Ivan pushes Viktor to his limit in training for the bout. However, Rocky trained Donnie to accustom his body to repeatedly absorb heavy impact, and uses Viktor's lack of technique and reliance on power punches to his advantage. Viktor enters the tenth round with a slight lead, but begins to tire, as he had never gone past the fourth round in prior matches without knocking his opponent out. Donnie knocks Viktor down twice in the round, causing a number of Viktor's supporters, including Ludmilla, to leave the fight. Seeing that his son is unable to defend himself, Drago throws in the towel, stopping the fight and allowing Donnie to emerge victorious. Drago hugs a humiliated Viktor after the fight, assuring him that it is okay and that he is proud.

Finally at peace with his past, Ivan focuses on developing a deeper bond with his son, jogging with him side-by-side.