There was one episode in season 2 where the main theme was a new type of drug that came someone from the future had brought back in time. Forgot the name of it now, but when you take it, you have a vivid dream. Alec took the drug because he wanted to see some hidden memories regarding his father. When he took it he saw an argument between his mom and his real dad from when he was a young boy and when his "real dad" turned around it was that guy who kiera met from the future who had been stuck in that time for 15 years. But we don't know if that is his real dad or just a fake memory from the drug. Plus we don't even know how relelvant it is, but it would make sense because apparently he never knew his dad but his dad was meant to be super intelligent and technical like that guy. But when they meet each other in a later episode they don't talk about it and the old guy doesn't seem to think he is his son, so the whole thing makes no sense. Its almost like the guy who he has met, has not gone back ni time yet and met alecs mom, that probably happens after the present if that make sense. ie the future occurs in the past or at a point later in time for the experience of that guy, he goes back in time and meets alecs mom and has alec then dies.