Blackest Night

Blackest Night was an awesome arc that took place from 2009 to 2010, which saw hordes of deceased superheroes being reanimated and controlled by the evil entity Nekron – and his lackey Black Hand – with the intention of eliminating all life and emotion from the universe.
They were all granted a black power ring – similar to those wielded by other Lantern Corps – and every single one of the other Corps had to come together to fight them off.
A movie version of the arc – which would essentially combine the superhero genre with zombie horror – would be absolutely incredible. It would have to take place several years down the line, as it would require a far greater number of established characters than the DC Cinematic Universe will have any time soon – and it would have to be scaled down (like Marvel Studios are doing with Civil War) – but, if it was executed well, it could be something really special.
Green Lantern is coming to the DC Cinematic Universe imminently – he’s getting his own film in 2020, but will certainly be introduced before then – and that could lead to other Corps being introduced, which would be both cool as hell and a means of making this story happen.
