The final arc begins with the return of Albedo. Having stolen the Omnitrix's designs, he creates the "Ultimatrix"—an upgraded version that allows him to evolve aliens into their "Ultimate" forms. However, Albedo is not the true mastermind.
A beach town is under attack by aquatic DNAlien mutants. Ben unlocks a new alien: Jetray (a fast-flying, ray-like creature capable of space travel). Key moment: First on-screen use of Jetray’s neuroshock blasts. all ben 10 alien force episodes