"You speak Russian?"
- — KGBeast
KGBeast is first seen in the pilot as an inmate at Arkham Asylum. When he and Harley are battling for the nuclear warhead being held inside one of the cars. Harley Quinn incapacitates him after a short brawl and grabs two of three keys off his body one by one, noticing an additional keyhole to get to the warhead after using each. After Joker and his men storm the train and throw Harley out, it is unknown what happened to KGBeast between this time and his next appearance at the Legion of Doom in episode 8. He is later rejected from joining the Legion of Doom, as the tide tipped in Harley Quinn's favor, he walked away, presumably out of the Legion headquarters and has not been heard from since.
KGBeast is a muscle-bound, pale, Russian cyborg. He wears a black glove on his biological hand with metal spikes on the knuckles to make punching more effective, he wears a black sleeveless shirt made of what appears to be spandex which also goes up to and covers his head along with his torso. It has three, wide red lines on his chest area, getting wider in with each one up. The head portion has two red marks up and down from each eye hole. There is no opening for any other facial orifice although there are bumps on the side for his ears to fit into. There is no visible pupil in his right eye, although this may be the mask covering it. His other eye is wider and more round, with a red pupil and black iris. He has a cyborg arm which has various hand attachments such as a middle finger, spoon, gun, and fist, which he keeps and pulls out of his grey satchel he has slung over his shoulder. There are orange tubes connected to his cybernetic arm.