KGBeast first clashed with the Justice League while robbing a bank with Blockbuster, Cheetah, and Copperhead. They were all defeated by Batman, Superman, Wonder Woman, and Green Lantern. KGBeast himself was taken out by an electric shock. Suddenly, the adults of the world disappeared to another dimension, including KGBeast, his partners in crime, and the Justice League.
KGBeast later joined Grodd's Legion of Doom. He sided with Grodd during the mutiny against Lex Luthor. KGBeast was seen firing his gun at unknown villains, but strangely enough, when Killer Frost froze to death the surviving faction that sided with Grodd, KGBeast must have switched sides, because he was standing among Luthor's group. However, he did not make it inside Sinestro's bubble when the revived Darkseid blew up the spacecraft.
KGBeast's name was confirmed with the 2008 release of a Mattel action figure bearing his likeness.
KGBeast is Anatoli Knyazev, an assassin trained by the KGB in the Soviet Union who would become a recurring adversary of Batman. Due to the fact that he is a lesser-known villain in his rogues gallery, KGBeast became one of the few Batman villains that managed to escape the Bat-embargo.
- "Kid Stuff"
- "I Am Legion" (Cameo)
- "To Another Shore" (Cameo in flashback)
- "Dead Reckoning" (Cameo)
- "The Great Brain Robbery" (Cameo)
- "Alive!" (Cameo)
|Members of the Secret Society|
|Grodd • Lex Luthor|
|Clayface • Giganta • Killer Frost • Parasite • Sinestro • Shade|
|Angle Man • Atomic Skull • Bizarro • Black Mass • Blockbuster • Bloodsport • Cheetah • Copperhead • Crowbar • Devil Ray • Doctor Cyber • Doctor Destiny • Doctor Polaris • Doctor Spectro • Dummy • Electrocutioner • Evil Star • Fastball • Giganta • Gentleman Ghost • Goldface • Heatwave • Hellgrammite • Javelin • The Key • KGBeast • Killer Frost • Lady Lunar • Livewire • Major Disaster • Merlyn • Metallo • Mirror Master • Monocle • Neutron • Nightfall •Psycho-Pirate • Puppeteer • Puzzler • Queen Bee • Rampage • Shade • Shark • Silver Banshee • Sinestro • Sonar • Sportsmaster • Star Sapphire • Tala • Tattooed Man • Thinker • Top • Toyman • Tsukuri • Volcana • Weather Wizard|