Warner Bros Animation says:
Knocked into the Antimatter Universe, Hal lands on a steampunk world. There, he meets the idealistic Steam Lantern, who patterns himself after the Green Lanterns. With help from his new allies, Hal must find a way back home before the Anti-monitor destroys his universe
“Green Lantern: The Animated Series” airs as part of DC Nation on Saturdays at 10:00 a.m. ET/PT on Cartoon Network.