Beast Boy and Numbuh 4 arrived at a laboratory. Beast Boy morphs back to his normal self. "Thanks for the ride." Says Numbuh 4 who's hair is messed up from the entire ride. "You ok?" Asks Beast Boy. "I am." Says Numbuh 4, "But let's get back to business." They arrive at a giant hole in the wall. "Whoa," says Numbuh 4, "Which cruddy bad guy can make their own entrance out of this wall?" Beast Boy looks at it and says, "I don't know, but it looks as if someone or something were to nibble through it like Swiss cheese." "I don't know." Says Numbuh 4 as he enters. Beast Boy follows him.

As they walk through the hallway, Numbuh 4 asks, "So do you have a girlfriend?" Beast Boy sighs and then says, "I did. But she betrayed me and my friends." "Why?" Asks Numbuh 4. "Slade helped her and she aided him into trying to destroy us. But at the end she turned on him and she saved us all." "Where is she now?" Asks Numbuh 4. "She turned to stone." Says Beast Boy. They soon enter a chamber full of testing chemicals and substances. "Alright you cruddy bad guy," Says Numbuh 4 as he takes out an upgraded G.U.M.Z.O.O.K.A., "come on out with your hands up!" They both look around at glass containers and tanks.

"Is it just us or is this place one big puzzle?" Asks Beast Boy. "How is this a puzzle?" Asks Numbuh 4 who still couldn't get his jokes. "Ok ok how about this." Says Beast Boy, "What will be let lose if you open one of those containers?" "Uh?" Says Numbuh 4. "It's water!" Says Beast Boy. "Oh please." Says Numbuh 4, "I'm not that much of a jokester."

As the two are looking around, they are unaware that in a tank behind them, Plasmus is spying on them. When Beast Boy and Numbuh 4 walked away from that tank, he breaks through the glass, surprising both of them. He roars at them. "Oh!" Says Numbuh 4, "This is going to get nasty!" "It is!" Says Beast Boy as the two prepare to fight. Plasmus pukes acid at them, who both jump out of the way as it corrodes the area they stood. "Highly corrosive acid." Exclaims Numbuh 4. He shoots gumballs at him, this time they explode into wads of sticky gum. This causes a mess on Plasmus and eventually gets stuck. Beast Boy turns into a rhinoceros and knocks him down.

As he and Numbuh 4 high five each other, Plasmus breaks free of the gum and gets back up. Numbuh 4 runs forward and jumps at him, only to get stuck in one of his green sewage eyes just like what happened before with Beast Boy. Upon seeing this, Beast Boy rushes to help him. He turns into a pterodactyl and flies towards Numbuh 4. He punctures the eye, causing a burst of sewage waste. They both fall to the ground covered in it. "Yuck!" Says Numbuh 4 as he wipes the sewage waste off of him. "And I thought that the Common Cold's snot was gross!" Plasmus approaches them both as they try to clean themselves up. "Come on." Says Beast Boy as he turns into a t-rex and they both rush towards the sludge monster to fight.