Yes, it finally happened. After years of speculation, “Mr. Robot” pulled back the curtain on its single biggest mystery. It activated the secret machine that Whiterose, the leader of the Dark Army hacker collective and the Deus Group secret society of 1 percenters, built beneath the nuclear power plant in Elliot’s home, Washington Township. It really is a device intended to access a parallel world, one brighter and better than our own. And if we’re to believe our eyes during the episode’s final scenes, it worked.

How? The show is playing that particular card close to its vest; all it reveals is that the machine requires so much energy that switching it on draws power away from the nuclear plant’s cooling system, causing a meltdown. Honestly, that’s all the information we need. After carefully walking us through several dozen elaborate hacking exploits over four seasons, the show has more than earned a little science-fiction hand waving where generating alternate realities is concerned.

This goes double when the buildup to the parallel-world revelation is so expertly crafted. Sam Esmail, the show’s creator and the writer and director of this episode, repeatedly presents us with some of the series’s most memorable — and bloody — imagery to date.

I reviewed this week’s big episode of Mr. Robot for the New York Times.