Cosma is one of the 4 main antagonists(alongside Lord Boxman, Darrel Boxman, Shadowy Figure) of the 2017 Cartoon Network series OK K.O.! Let's Be Heroes,serving as one of the three overarching antagonists (alongside Billiam Milliam and Shadowy Figure) of Season 1, one of the 2 main antagonists(alongside Darrell Boxman) of Season 2, and a minor antagonist in Season 3. She is a reptilian supervillainess with the ability to manipulate her own molecules, who invests money into the schemes of other villains. She is notably one of the three main investors of Boxmore, and the superior of Lord Boxman, whom she continually tries to stop from attacking Lakewood Plaza Turbo and wasting resources. Despite her influence over Boxmore, she only ever directly opposes the Plaza heroes in "Deep Space Vacation".