It doesn't matter if it's sworn enemies for reasons unknown or former friends who just can't stand each other anymore, rivalries keep us tuning in again and again.
Check out our list of duos whose clashes, feuds, or fights were some of the most exciting on television.
1. Stefan vs. Damon - The Vampire Diaries
These two brothers had a rivalry that lasted for centuries. Women were the main cause, but in the end, these two were able to put beauties aside and restore their once strong brotherly love.
2. Krystle vs. Alexis - Dynasty
There is no greater rivalry in television history than that of Krystle and Alexis. The wife and ex-wife of Blake Carrington were the most compelling part of the original Dynasty. Their cattiness, jealousy and epic fights made for dramatic and sensational viewing. Who wouldn't tune in week after week for that kind of fun?
3. Penguin vs. Jim - Gotham
Jim and Oswald have a long history. There's a love/hate relationship between them that is unrivaled on television today. Each is privy to the other's secrets yet neither rats the other one out. Jim may want to end Penguin's reign and Oswald may want to end Jim, but the two of them complement each other in more ways than they are ready to admit.
4. Angel vs. Spike - Buffy the Vampire Slayer
It never turns out well when two men are in love with the same woman. When Spike came to town wanting to kill Buffy, Angel did all he could to stop his old friend from doing the deed. Eventually, Spike ended up falling in love with her as well which created all sorts of havoc and jealousy - and complications.
5. Sheldon vs. Wil Wheaton - The Big Bang Theory
Sheldon has held a grudge against Wil for what seems like forever. The ridiculous rivalry has included Twitter wars, an epic card game and ruined movie premieres? And all because of a Star Trek convention gone wrong. Go figure!
6. Buffy vs. Faith - Buffy the Vampire Slayer
Buffy and Faith may have had the same goals, but they had very different ways of getting there. While Buffy wanted to save lives, Faith had no problem taking them. It became worse between the two when Faith jumped over to the dark side, but eventually she found her way back into Buffy's good graces.