"The Variable" was the most important episode and the best so far with "The Life and Death of Jeremy Bentham". It was a tense, tragic, dramatic and emotional. I was completely satisfied with this episode. The main themes of 'Fate' and 'Free Will' were really explored in this episode which finally reinforced the "whatever happened, happened" rule of time. And finally we got the answer to the origin of the swan station built and the reason why they are required to press the button. The most emotional moment was definitely when Daniel finally talks to little Charlotte and the tragic end of fate.