Rocky IV (1985)
This is a solid movie.
This is the most financially successful film in the franchise. Wyoming doubled for the frozen expanse of the Soviet Union. Some of the original scenes filmed with Dolph Lundgren have authentic punches and Stallone was even hospitalized because of it. Weathers almost quit after an aggressive incident with Lundgren. Sportscaster Stu Nahan makes his fourth appearance in the series. Stallone's then-wife, Brigitte Nielsen, appeared as Drago's wife, Ludmilla. This is the only film in the series not to feature original music by composer Bill Conti. It was the highest-grossing sports film of all time until 2009.