5. The Legend of Zelda
With such a vast story and with 3 different timelines, The Legend of Zelda can be adapted into pretty much anything. Either as a movie, or a TV series, or a novel, whatever, and if I had to chose which game on the franchise can be turned into a TV show, I believe the first game on the NES could be a good start. The first game is centered around Link trying to release the Princess Zelda from Ganon's mischievous hands. So, in order to do this he must find the pieces of the Triforce that would allow him to fight Ganon. That alone sounds like a really cool premise to see as a TV show, with Link finding different pieces of the triforce and then having a big finale with him fighting Ganon. That could be really cool if the creators of the show plan to do it for some time, and after he finally defeats Ganon, a series based around The Adventures of Link could be really cool as well.