OK K.O.! Let's Be Heroes 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. The web series premiered on Cartoon Network's YouTube channel and on Cartoon Network Video on February 4, 2016. Produced by Cartoon Network Studios, each short episode is animated by different companies such as Science SARU and Yotta.
On March 9, 2017, nearly four years after the original short's premiere, Cartoon Network announced that the television series had been greenlit. The opening sequence was storyboarded by Japanese artist Hiroyuki Imaishi, co-founder of Studio Trigger.