When KO finds himself trapped inside a mysterious place, he encounters other Cartoon Network Heroes and they band together to escape.
Episode: Crossover Nexus
About OK K.O.!: An enthusiastic young boy earns a job at a hero supply store and trains to become the "Greatest Hero Ever."
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"Crossover Nexus" is the 23 episode of Season 2 of OK K.O.! Let's Be Heroes and the 77 episode...