Here's a simple plot to follow or make up your own, as always use the character that's been chosen.
Go for it fellow creators! :D
Sinestro has created a Deadly Machine that's aimed at the Earth orbiting the planet.
Green lantern(s) of your choice, one or many have been sent by the Guardians of the Universe to put a stop to the threat.
A battle ensues.
Let's leave this to Dec 31st due to the holidays coming up.