It is a 3 part episode which will conclude everything they have been building towards, Zile is finally revealed as the villain that he is. What took them so long? It is about time.
I thought for a moment at the end, they might do the reset button when Conner was talking nicely with Zile, but thankfully that didn't happen.
Now the question is, who are those mysteries people, who might be even more evil than Zile? What does Speed do now? It is an even playing field, because Speed knows he has an enemy that will stop at nothing to get the Mach 6, no more element of surprise advantage for Zile.