OK K.O.! Let's Be Heroes is an American animated television series created by Ian Jones-Quartey for Cartoon Network. The show is based on Jones-Quartey's pilot Lakewood Plaza Turbo, which was released as part of Cartoon Network's 2013 Summer Shorts project. It was produced by Cartoon Network Studios. The web series premiered on Cartoon Network's YouTube channel and on Cartoon Network Video on February 4, 2016. On March 9, 2017, nearly four years after the original short's premiere, Cartoon Network announced that the television series had been greenlit, and it premiered on August 1, 2017. The opening sequence was storyboarded by Japanese artist Hiroyuki Imaishi, co-founder of Studio Trigger.

On December 4, 2017, the series was confirmed to be renewed for a second season, which premiered on March 18, 2018. A third and final season, which was announced on June 26, 2019, premiered on July 7, 2019; the final episode aired on September 6, 2019. The show was available to stream on Hulu until it was removed in October 2024; It was also available on HBO Max, but was one of several shows removed in August 2022 as a result of the Warner Bros. Discovery merger.