The Monarch has the Venture family captured but must release them when Dean suffers from testicular tortion.  Dr. Venture takes him to the Quizboy and Mr. White to have the problem corrected, while Brock and Hank are held as collateral.

Venture Brothers
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Venture Brothers Season 1 Episode 9 Quotes

Hank: I never met my grandfather. I never even met my mom.
The Monarch: Hank... what would you say if I told you that your mother was someone you've met before?
Hank: What?
The Monarch: And what if I told you that your father is not your real father? Hank... Hank! I am your real father!
Hank: No way. No way, that's not true!
The Monarch: Psych! Hahaha, you were all, "Oh, daddy, you're my daddy!" You are so gullible, what is that like?!

Henchman 24: Come on! They have one female servicing a large group of males. That implies a species that lays eggs.
Henchman 21: Oh my God, you're crazy! They're so obviously mammals!
Henchman 24: Please! She'd be in estrus 24/7 if she didn't lay eggs.
Henchman 21: Smurfs don't lay eggs! I won't tell you this again! Papa Smurf has a fucking beard! They're mammals