Dragon Ball Super S03E18 - The Amazing Copy-Vegeta!

A powerless Vegeta is forced to escape with the others from the Vegeta duplicate and Gryll, Potage revealing the two to be extensions of a rogue bio-weapon called Commeson (コメソン, Komeson), which established the Superhuman Water legend by assuming the form and personalities of invaders that led to going berserk. The group also learn from Potage that the original will disappear once cloned, as was the case of the real Gryll and his men, unless the duplicate is destroyed in time. Goten and Trunks attempt to destroy the Duplicate Vegeta as Gotenks before Goku senses them in dangers comes to their aid. As the Duplicate Vegeta acquired Vegeta's personality as a side effect, he fights his Commeson nature and dispatches the Duplicate Gryll so he can fight Goku.