The Monster Potion is one of Dexter's many inventions. It was used only in the episode "Monstory" when Dexter and Dee Dee both used the potion to become large powerful monsters. When ingested, the potion transforms the consumer into giant mutant monster of any possible size and shape, and as time passes, the user becomes more powerful, gigantic and monstrous to the point where the user can become as large as a continent and be seen from space. As Dexter and Dee Dee transformed into different monsters, it appears that the transformation varies from person to person.