Leave it to Rupert Murdoch to spoil the surprise.

The media baron’s Sunday Times is reporting details of what will happen at Friday’s London 2012 Games $42 million opening ceremony created by filmmaker Danny Boyle.

Think 30 Mary Poppins’ vanquishing Lord Voldemort and children in hospital beds spelling out NHS — National Health Service.

That’s after Boyle himself admonished all 60,000 guests at the dress rehearsal Monday to “Save the Surprise,” to the point where #savethesurprise was trending on Twitter.

Hundreds of people sent out messages on the social networking site saying they saw the show — but couldn’t tell.

Before the Sunday Times’ disclosures, what had been known about the Olympic opening ceremonies had all been spilled by Boyle himself a month ago: a first sequence depicting a bucolic “green and pleasant land” complete with maypoles, live animals and a real cricket game.

But just about all of the 60,000 people at the dress rehearsal sworn to secrecy by Boyle seem to have kept their promise to “Save the Surprise.”

Twitter user Eric Baradat had let the most slip: “Rural England, Industrial Revolution, rock, pop, punk, house music, bond, Mary P and plenty more but #savethesurprise.”

Andrew Tod, another of the dress rehearsal crowd, explained how Boyle nearly pulled off the Big Secret:

“He said we were, in effect, part of the show. He recruited us into his big secret, his gang and I swear everyone in there was thrilled to be asked. I want to be in Danny’s gang.”

Now Dipesh Gadher and Kate Mansey, writing in the Murdoch broadsheet, say they’ve found someone ready to break that promise.

A 40-foot Lord Voldemort, evil nemesis of Harry Potter in J.K. Rowling’s books, will kill the happy mood of fantasy children’s literature characters with his arrival trailed by Dementors, the newspaper disclosed.

Then “30 actors depicting Mary Poppins, the magical English nanny, will descend from the roof of the stadium with their opened umbrellas. The nightmare will be banished and happiness restored,” the Times said.

Just before that “jaw-dropping” pageant, nurses will wheel children on 100 hospital trolleys for a choreographed “bed dance.”

The Times also felt compelled to reveal even smaller details such as Sir Paul McCartney closing the show by singing “Hey Jude” and bubble-making machines filling the stadium during the tune “I’m Forever Blowing Bubbles.”

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Will all this come to pass?

AP London correspondent Jill Lawless, who was also there, kept the secret but did tweet the ceremony was “splendidly British and magnificently bonkers.”