Digimon Adventure: Season 1 Episode 31 A new Darkness, Millenniumon ( Air Date 2021-01-10 ) Genre Animation, Sci-Fi & Fantasy, Action & Adventure, Kids category. Overview "Taichi and Agumon finally surpassed their limit, and Agumon evolves into Wargreymon. This evolution awakens Lopmon’s long-lost memories. And Taichi learns about the new threat, Millenniumon.".