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OK K.O.! Let's Be Heroes (also known simply as OK K.O.!) is an American superhero comedy animated series created by Ian Jones-Quartey (known for his work on Adventure Time, Steven Universe, Secret Mountain Fort Awesome, and nockFORCE) and based on his pilot short Lakewood Plaza Turbo, which was released as part of Cartoon Network's 2013 Summer Shorts project. On December 7, 2017, show creator Ian Jones-Quartey confirmed via Twitter that a second season had been greenlit. The show was renewed for a third season in 2019, and it was confirmed that it would be the series' last following the show's cancellation.
The series concluded on September 6, 2019, after three seasons and 112 episodes.