"Tag Sale – You're It!" is the tenth episode in the first season of The Venture Bros.
The Monarch, Dr. Girlfriend, and henchmen 21 and 24 meanwhile get to the sale and thus far are having a blast, the Monarch himself being particularly chipper (all the while making insulting comments about the wardrobe choices of some of the other villains). As they wait in line, they cringe in disgust when Baron Ünderbheit must take off his lower jaw for the metal detector. In the same line, Master Billy Quizboy and Pete White talk about Dr. Girlfriend's deep voice and rumors of her having a baboon's uterus transplanted into her. This leads to suspicions of her being a transsexual. Despite this, the two unsuccessfully hit on her anyway, proposing a hero / villain type arrangement, and attempt to impress her with Billy Quizboy's hydrocephalic head and Dr. White's albinism.
Dr. Venture is merely attempting to enjoy making some cash and relaxing in the sun, having sold a prototype lightsaber to #21. Apparently, the fact that it cost over $2 million in parts alone was too much for Kenner to stomach, and the Army passed on it, due to the fact that they no longer sword fight. To Dr. Venture's dismay, Dr. Orpheus comes in, asking how the yard sale is going and more importantly, how glorious the life of a super-scientist must be, having enemies and adventure at every turn. Dr. Venture wryly remarks Dr. Orpheus can have that life, to which the necromancer admits that he frankly envies Dr. Venture. Upon encountering the Monarch, Dr. Orpheus unsuccessfully tries to make him Orpheus's personal arch-enemy by slapping him and giving him a magically-induced hotfoot.
When the Monarch makes a quick, unsuccessful trip to a porta-potty, Dr. Girlfriend is found, and hit on, by the Phantom Limb, who mocks the Monarch to her displeasure. When the Monarch returns, he admits that the tag sale is getting flat-out boring. He shoots a small projectile from his wristbands that hits Baron Ünderbheit in the back of the head, who mistakes a civilian shopper for the deed. Ünderbheit's attack quickly causes the tag sale to become a destructive riot. Hank's business is torn down with him temporarily knocked off his feet by a flying shoe, and Brock immediately begins pounding down various evildoers. When #21, thinking he now has power with his lightsaber, attempts to use the weapon against Brock, the saber passes right through him, it was simply a light-projection, with no offensive capabilities. #21 flees. Meanwhile, Dr. Orpheus gladly joins in the fight, attempting to shout out amongst the fighting that he needs an arch-enemy and is happy to make one, and incorrectly assumes Dr. Venture is going inside to protect the front of the compound when he merely is going off to count the profits.
Meanwhile, Monarch and Dr. Girlfriend have sneaked into the Venture Compound to find a working bathroom. After that mission is successful the duo now need something to do, preferably something that would strike at the heart of their arch-enemy. They can find nothing, despite wandering through most of the Venture compound, and figure Dr. Venture's lab ought have something. The Monarch is unimpressed by Dr. Venture's lackluster workstation. After having toured the house and deciding that Dr. Venture's life is really quite pathetic and pitiable, The Monarch is ready to give up harassing Dr. Venture entirely when he and Doctor Girlfriend are surprised and attacked by some of the government agents. After a brief scuffle where The Monarch quite handily defeats the agents, he poses and gives an impromptu and melodramatic monologue on how he, the Monarch, would still destroy Dr. Venture. Other members of the Venture family await the end of the monologue in another room. The two villains use a grappling hook to escape other agents, but end up simply hanging near the ceiling for several hours, until it is safe enough for them to leave.