Simon heads to the Atlantic while Underdog tries to stop him. But Simon is too quick and dries up the Atlantic and leaves Underdog stuck in a mud patch. Back at his laboratory Simon declares all people to be his slaves. They will do what Simon says or they will get no water. Polly asks him how he can do that since he dried up all the water. Simon shows how the Big Dipper works, changing the atomic structure of water and stores it in little jars and how it can be reversed to bring the water back. But the people still refuse to obey Simon. That is ok with him; he can wait until they get thirsty enough.
While Underdog struggles in the mud patch, the people get thirstier while Simon sits on his porch drinking nice, clear water. The people finally give in. One man gives Simon $1000 for a glass. Simon tells others to work for him and they too will get water. Simon gets them to call him Master.