The story follows the traditional Hal Jordan/Green Lantern story lines to a certain degree including the battle between Legion and Abin Sur, Abin Sur’s crash landing on Earth, as well as the choosing of Hal Jordan over Guy Gardner and Clark Kent.
Parts are straight out of the Emerald Dawn series including Jordan’s simulator being ripped out of the training center and flown to a dying Abin Sur and Hal Jordan going to Oa to help defeat Legion.
The major difference is in the Sinestro character arch. I don’t want to give too much away but the writers were very careful to stay true to the character without blowing their load on the first film.
The other difference is also introducing Hector Hammond into the story line and making him the big threat to Earth or Gaia if you prefer.
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