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Thousands of the world's top athletes are in London, ready for the official start of the Olympics. The opening ceremony is Friday night.

It's a $42 million show, and no one's supposed to know what the show looks like before Friday night. But a few details have leaked out. We hear there will be live animals and one of Britain's most famous performer's for the finale.

Sixty-thousand people will pack Olympic stadium for the show called "Isles of Wonder."

It's the biggest secret in London right now -- how will "Slumdog Millionaire" director Danny Boyle entertain billions of viewers around the world?

"Trying to save the surprise, not because we want it to be a secret but because we want the delight of the evening to be based on discovery,” says Boyle.

Even though some video of the rehearsals has been made availabe, the cast of 15,000 is sworn to secrecy. The Daily Mail reports Paul McCartney will close singing "Hey Jude" -- and ask the audience to join him.

Mariel Zagunis carries the flag for the U.S., an honor she says is almost surreal:

"It's absolutely incredible. So speechless. I'm probably going to cry,” says Zagunis.

Around Olympic Park there's plenty for the public to see and do.

Workers are putting the finishing touches on the park and competition venues, including the aquatics center where Michael Phelps could win more medals than any other Olympian in history.

Phelps is not feeling the pressure.

"It's really how many toppings do I want on my sundae and that's what I'm doing. I'm having fun,” says Phelps.

Archery is the only sporting event happening Friday.

Security's tight. FBI agents are helping British soldiers keep the Olympics secure.

Two-hundred and sixty-five pound wrestler Dremiel Beyers joked maybe he should be on the security team, “Usually I'm my own security (laughter) all these guys should feel safe 'cause I'm here."

The Olympic torch is here, too. Welcomed by the royals Thursday, it arrives at the stadium Friday night.

You can watch the opening ceremonies on Channel 13 at 6:30 p.m. and follow Olympic coverage on WHOtv.com here.