Baron Ünderbheit was one of Dr. Rusty Venture's old college friends on The Venture Bros.  However, after a freak lab experiment in which Rusty was his lab partner, Baron Underbheit's mouth was disfigured and he was forced to wear a metal jaw.  Since then he has seeked revenge on Venture.

The Baron is a member of the Guild of Calamitous Intent and lives in Ünderland, where he rules with an iron fist.  However, during the second season, the Baron was ousted from his land and was last seen begging for a place to stay from the Monarch.

Baron Underbheit Quotes

Baron Underbheit: You have to give me this one. I've loathed Venture ever since college.
The Monarch: Oh, who hasn't, Ãœnderpants? What makes your case so special?
[Baron points to his jaw]
The Monarch: Wow, you mean he did that? How?
Baron Underbheit: Where I come from, a lab partnership is a sacred trust. One is always suppose to look out for one's lab partner. Venture did not.
The Monarch: Fine, fine. But you have to understand you can't waltz into the middle of a delicate, high-stakes chess tournament and yell, "King me!" 'cause he bitched up your face

Baron Underbheit: Catclops! What have you to report?
Catclops: Tourism has skyrocketed at the Well of Bitter Sorrows and the Underbheit Birth Crevasse since you enacted the mandatory attendance edict.
Baron Underbheit: Told you. Girl Hitler?
Girl Hitler: Benzene chewables have doubled production in ze child slave mines. Dilly-dallying saw a brief spike, but ve stabilized it by removing ze feet of the alpha males, Und de popular girls!
Baron Underbheit: Good! Good

Venture Bros. Quotes

Hank: You are not the boss of me
Sgt Hatred: Au contraire, I am tony danza to your spunky Alyssa Milano. I am full on Charles In Charge of you

Hank: Is it just me or does every Nazi want to clone Hitler? It's like the only they think about
Srgt. Hatred: It seems that way, right. I guess when everyone hates you, you just fixate on making rotten Hitlers