Who's The Greatest Hero Who Wins Using Brains Instead Of Violence?

Everybody loves an action hero. But there's something immensely satisfying about a hero who doesn't carry a gun, or punch a motorcycle while kicking an explosion. Sometimes the best heroes use intellect instead of action — but who's the best thoughtful hero of all time?

Please include a picture, poster or clip depicting your favorite hero who uses her or his brains instead of massive guns. And please tell us his/her name, where he/she appears, and why he/she is so successful at thinking his/her way out of trouble. Thanks!

Top image: Three Doctors from Doctor Who, the show that pretty much owns the "brains not brawn" hero archetype.