1. The Legacy of Kain
This. Anything related to this series of games needs to happen right now. A sequel, a movie, whatever, just make it happen. It has a great storyline with some of the coolest characters I've ever seen in a video game, and the world of Nosgoth is one of the most incredible in fiction. This is a series that can be definitely turned into a TV show. Which game? I especially lean towards Soul Reaver, since it's one of the most popular games in the franchise and leaves the door open for a sequel that would be based on a very cool game. Raziel's story in Soul Reaver was a very sad story notable not only for the incredible dialogue , but also the great process in which he acquired his powers through the game (battling his brothers), which can be a great gimmick for the series. With a dark and compelling story featuring some of the coolest and most badass characters ever to be featured in a video game, a TV series based around the game could gather an even bigger audience for the games. Maybe in the future we might see another sequel for the game; I know that that sounds unlikely, but I will never lose my faith.