Tonight’s episode has David toying with time, aggressively, to try to right what he sees are the wrongs he and others have committed, and to both alter and save the future. This happens so often in the Marvel universe – both The X-Men and The Avengers franchises already have used time travel to alter destiny – that why shouldn’t it happen in Legion? Except, on this show, the time stream, like the plot, is particularly difficult to follow. But it’s worth it…