Not a bad series, tho it begs the viewer to challenge precepts of time travel, much as did "12 monkeys" which lost its way under that burden; tho i wonder if they started with the most emotional element and built from there, being the most unique. I was intrigued that time travel is clearly difficult by being claustrophobic long, squeezy tunnels of dirt only to open oven - sized doors once a breaching portal is reached. If you draw yourself a string board that reveals the secrets thus found would it make more sense than stumbling onto realities that don't? They did a good job writing, casting, location, filming, but for me I'm having friends watch it so we can have conversations behind it to see where we land on the theories they draw from precepts and anything else they find noteworthy. This is a recommendation to have your own knowledge of time travel challenged. Non-linear storytelling so keep notepad ready.😆