Spoiler alert: He’s alive.

Jon Snow (Kit Harington), who “died” at the end of Season 5 after he was assassinated by members of the Night’s Watch, did something entirely expected at the end of Sunday night’s episode of “Game of Thrones.” He (umm) un-died.

In a moment fraught with drama, silence, camera close-ups and even a tight shot of the most loyal direwolf of them all (Ghost), Snow suddenly took a deep breath and his eyes opened wide. Cut to credits.

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Get ready for the Internet to crash, or maybe it did already Sunday night. There hasn’t been a bigger prime-time cliffhanger since that Who-Shot-JR business played out on “Dallas” more than 35 years ago.

Everyone had opinions about his future, and any of them could have either been wrong or right. After all, there is no longer a book — the next volume of George R.R. Martin’s “A Song of Ice and Fire” has yet to be published — that offered any guidance on the matter.

Therefore, it was a matter of what some fans had taken to calling “Game of Throne’s” Schrödinger’s Cat paradox (referring to the famous quantum mechanics scenario): He was both dead and alive.

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But a paradox no more: He was very much alive Sunday night.

Here’s how it played out: The red priestess from Asshai, Melisandre (Carice van Houten) was summoned by Davos Seaworth (Liam Cunningham) in a last effort to bring Lord Snow back, before he was to be consigned to his funeral pyre (a hot one). Dispirited after her miserably bad calls at the end of last season (recall that she told King Stannis to sacrifice his own daughter before storming Winterfell — and you know how that worked out), she faltered then began to offer some halfhearted incantations. Nothing seemed to work . . . and she left.

Then, with only the camera and 10 million fans looking on, Jon Snow returned.

@Newsday

This argument at long last has been settled: He lives.

And how.