It was announced during the Toonami block of the Adult Swim Festival that SSSS.Gridman will be joining Toonami’s anime lineup in January 2021. Below is a synopsis of the series from Crunchyroll:
Yuta Hibiki can’t remember who he is, and now he’s seeing and hearing things that others don’t! A voice from an old computer tells him to remember his calling, and he sees a massive, unmoving creature in the distance. Nothing’s making sense—until the behemoth springs to life! Suddenly, Yuta is pulled into the digital world, reappearing in the real one as the colossal hero—Gridman!
The 12-episode series is currently available to stream on Crunchyroll. A follow up series titled SSSS.Dynazenon has been announced back in December. This new series will take place in the same “Gridman Universe” but as of right now, no release date(s) have been announced.