The Venture Bros Season 4 Episode 8 - Pinstripes & Poltergeists Episode Title:Pinstripes & Poltergeists.Episode Description:The Monarch decides to team up with Monstroso, a Guild member and ruthless lawyer in his newest plan to defeat Dr. Venture. It is an attempt to force Venture to give up his compound as it was built with the sole purpose of good-doing, and if a certain percentage of the land is not in that use, then Monstroso gets the land. However, 21, with 24's apparent ghost guiding him, begins to suspect something is up and finds that Monstroso has double-crossed the Monarch, and will gain all of his assets as well. While Venture plans on leasing some land to Pete White and Billy Quizboy, they find that one of the buildings on the Compound is occupied by SPHINX who, throughout the episode, have been hiding Monstroso's actions from Brock in an attempt to keep him away from the Ventures. 21 decides to take things into his own hands, infiltrating the Venture Compound to stop Monstroso, but comes across Brock, instead. They fight, and 21 is actually a match for Brock, even though Brock ultimately wins. They decide to instead team up and attack Monstroso together to stop his plans to take both the Venture Compound and the Monarch's assets.