DescriptionOriginal/New Sealed…“The Oz Effect, Part Four”: Superman continues his efforts to end the civil war at Logamba. The toxic gas launched by the rebels has reached the capital, but Superman quickly redirects it into the atmosphere and moves it into outer space, where it harmlessly dissipates. With the gas neutralized,Oz won’t save you. He’s trying to make a point… and using you to do it. SUPERMANAction Comics #990 is an issue of the series Action Comics (Volume 1) with a cover date of December, 2017. It was published on October 25, 2017.