The episode opens with a high-tech break-in at a Plumber base in Fort Weaver.
In the first half of the two-part Season 4 finale, Ben faces his greatest challenge yet as a "Greatest Hits" gallery of villains unites to destroy the Tennysons. ⚡ The Plot Summary [S4E8] Ben 10 vs. Negative 10 Pt. 1
While the villains keep Ben, Gwen, and Max busy, the King successfully steals the energy source from Mount Rushmore. 🦹 The Negative 10 Lineup The episode opens with a high-tech break-in at
The Tennysons retreat to the Plumber HQ inside Mount Rushmore for a final stand. and Max busy
The Negative 10 hunt for the "Sub-Energy," a highly volatile and powerful source stored in Plumber vaults.