20 TV Shows That Failed To Stick The Landing

All The 100 ever needed to be was what it promised in its first two seasons. 

The plot, in its early days, was simple: Generations after a nuclear apocalypse, a group of teenage prisoners aboard a space station housing the last remnants of humankind are sent down to earth to see if the planet is ready for resettlement.

On the ground, the titular 100 encounter warring tribes of people lost to time, and must decide who to trust, fight with, and fight for. It's a fun, thrilling coming-of-age actioner, full of compelling characters and decent tension, until midway through its run it became far too concerned with going capital-B Bigger. 

With villainous artificial intelligence and time travel, The 100 became a textbook example of a series throwing whatever it could at the wall to see what would stick, and given how messy it became - and how many of its characters became little more than plot devices than actual people - not a lot of it did.