In 'Rocky IV', who is Rocky's Soviet opponent?

In 'The Social Network', which actor plays Mark Zuckerberg? In 'Top Gun: Maverick' (2022), which actor plays Rooster? In 'Rocky', what is the name of Rocky's girlfriend and later wife? In 'Rocky', who is Rocky's opponent in the heavyweight title fight? In 'Rocky', which famous steps does Rocky run up in Philadelphia? In 'The Karate Kid' (1984), who is Daniel's teacher? In 'Star Wars', what is the name of Han Solo's ship? In 'Star Wars', what is Chewbacca's species?