The Unicorn Annihilator is a one-time villain from the 2016 reiteration of the Cartoon Network original series The Powerpuff Girls, only appearing in the episode "The Last Donnycorn". He is a unicorn cyborg, parodying The Terminator from the film of the same name.
He was voiced by Eric Stuart.
The Unicorn Annihilator emerged from a mysterious mirror in the middle of a dark cave, along with four other shadowy figures. From the moment, the Unicorn Annihilator came out, it was guns-a-blazing, ready to destroy Donny the Unicorn. Donny ran for his life, and narrowly escaped the annihilator's wrath, and hid out in a bowling alley, where he found The Powerpuff Girls and told them his story.
The Unicorn Annihilator broke through the roof of the bowling alley, having found Donny again. Once more, the Unicorn Annihilator started firing lasers at Donny, trying to kill him. Donny got ready to run away in cowardliness again, but The Powerpuff Girls stopped him and said that they'd be taking him out. The Powerpuff Girls beat the robot senseless and blew it to bits, presumably defeating him.
While The Powerpuff Girls and Donny talked, the destroyed body of the Unicorn Annihilator reassembled and came back for revenge. This time, it was too tough for The Powerpuff Girls and it took them all out. Donny was its next target and Donny had to do something to save himself. Donny offered the Unicorn Annihilator many things, begging for its mercy. One of the things he presented the machine with, was a trophy for making macaroni paintings. The Unicorn Annihilator shot a laser into the curved metallic trophy, making the laser get blasted right back at itself, destroying it for real this time. As the Unicorn Annihilator laid, dying on the ground, it uttered the last words "He is the chosen one.". Finally, the Unicorn Terminator was diminished down to its purest form, which was apparently just a sock. As terrible as this battle may have been, it was only the beginning of what was to come, now that Unicorn Land was faced with The Four Unicorns of The Apocalypse.