[s4e8] Ben 10 Vs. Negative 10 Pt. 1 -

The episode opens with a high-tech break-in at a Plumber base in Fort Weaver.

The Tennysons retreat to the Plumber HQ inside Mount Rushmore for a final stand.

Cooper, the grandson of a Plumber friend, joins the team; his technopathy is vital for defense.

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

While the villains keep Ben, Gwen, and Max busy, the King successfully steals the energy source from Mount Rushmore. 🦹 The Negative 10 Lineup