Game of Thrones Actors' Previous Roles: You'll Never Guess Where Joffrey Got His Start! >>Hollywood

The actors' on HBO's most-watched series tend to really disappear into their roles.

So much so, in fact, that many Game of Thrones actors look completely different in real life than they do on the show. 

Of course, most of the folks who currently populate Westeros didn't get their start in the Seven Kingdoms.

For the sake of believability, producers made an effort to avoid mega-famous A-listers when casting GoT but whether you realize it or not, you've seen some of your favorite sers, maesters and Wildlings in previous projects:

13 Game of Thrones Stars in Earlier Roles

1. Peter Dinklage as Tyrion Lannister

These days, Peter Dinklage is best known as fan-favorite Tyrion Lannister.

Some GoT actors' previous roles are sure to shock you (Grand Maester Pycelle was in Star Wars?!), while others are common knowledge amongst hardcore fans (The two actresses who appeared in Harry Potter and GoT should both be dubbed Queen of the Fantasy Nerds).

So jump into the gallery above to find out why Tywin Lannister looks so damn familiar. You'll be armed with all the information you'll need to impress/annoy your friends during this Sunday's season finale.

And, of course, if you need to catch up in time for the conclusion of season four, you can always watch Game of Thrones o