Travel across the galaxy with John Sheridan as he unexpectedly finds himself transported through multiple timelines and alternate realities in a quest to find his way back home. Along the way he reunites with some familiar faces, while discovering cosmic new revelations about the history, purpose, and meaning of the Universe.

Recently discharged Marine sniper John Stewart is at a crossroads in his life, one which is only complicated by receiving an extraterrestrial ring which grants him the powers of the Green Lantern of Earth. Unfortunately, the ring doesn't come with instructions - but it does come with baggage, like a horde of interplanetary killers bent on eliminating every Green Lantern in the universe. Now, with the aid of the light-hearted Green Arrow, Adam Strange and Hawkgirl, this reluctant soldier must journey into the heart of a galactic Rann/Thanagar war and somehow succeed where all other Green Lanterns have failed.

The film explores the world of firefighters in 1920s New York City and tells the story of a 16-year-old girl who will have to become a hero in order to save her city.