Ben 10 Season 4 Episode 9 Ben 10 vs. the Negative 10 (Part 2) Episode Title:Ben 10 vs. the Negative 10 (Part 2).Episode Description:Ben, Gwen, and Max, along with Cooper, use the Plumbers' Mount Rushmore installation to mount a final stand against the Forever King's forces. Max discovers that the Forever King was once a plumber named Driscoll who was kicked out after hoarding alien technology. Despite their best efforts, they are unable to keep Driscoll from obtaining the Sub Energy. Driscoll uses the energy to enhance his armor suit and battles Ben, who is able to use Upchuck to digest the power source and destroy it safely (he obliterates the Mount Rushmore faces in doing so, however).