The Cartoon Network has provided clips from the May 26th episode of Green Lantern: The Animated Series, "Homecoming". This is the final episode for this first "mini-season" of thirteen and features the debut of a blue wearing Saint Walker.
Here's the synopsis of the episode:
Atrocitus wreaks vengeance on Oa, as the Red Lantern armada crosses into Green Lantern space – with only Kilowog to stop them. It’s up to Hal to take the shortcut back to Earth by teleporting across the universe from the Star Sapphires’ homeworld of Zamora and stop Atrocitus and Zilius Zox from killing the Guardians.
Green Lantern: The Animated Series airs on the Cartoon Network Saturday mornings at 10am and is available for digital download from Amazon on Demand, iTunes, PSN and the Zune Marketplace on the Xbox 360.