Legends Season 2 will spy greater serialization and bring ‘closure’ to the central mystery that is Martin Odum’s identity, showrunner Ken Biller vows in an interview with THR:
The train kind of stopped after season one, and there was a desire to reimagine the show. I really started from scratch in a way. Basically what they said to me was “We love Sean Bean, we love Howard Gordon and we’re interested with this source material —but we thought that the show in the first season was too traditional, too case-of-the-week.” I hit upon a notion of how to tell the show in a more modern, novelistic, serialized way, and I pitched that approach to the studio and the network. They really liked it. I pitched it to Sean, and Sean loved it. Once he was on board, with it, we hired a whole new cast with the exception of Morris Chestnut. It didn’t have anything to do with not liking any of the actors from the first season, but because of the new approach, the new storyline set in new locations, we started casting all of the new roles. So basically the first order of business, as it always is really, is the script.
On answering the central question by the end of Season 2:
One thing that I wanted to do this season that I thought I really owed the audience is that question of “Who is Martin Odum?” Identity is the main theme of the show. If the audience watches Season 2 of Legends, when they get to the last episode, they will be told who Martin Odum really is. I thought it was important to not just keep teasing the audience and give them the real answers. The reward for the audience of just paying attention and sticking with it is they’re going to get a lot of answers.