A galaxy of stars will come together on NBC this weekend to raise money for the tsunami disaster zone, and ìExtraî sat down with organizer George Clooney on Friday to get some inside details on the Hollywood crusade.

Despite a busy week that took him back and forth across the Pacific for the Japanese ìOcean's 12î premiere, Clooney said he's ready to lead the charge. ìIím tired, we just got home yesterday afternoon, and we came over here and got back to work,î he admitted.

Clooney has taken on the role of recruiter, using every number in his black book to assemble celebrity pals including Brad Pitt, Madonna, Sheryl Crow and former Presidents Bush and Clinton.

ìOnce you get Former President Clinton and Former President Bush and Clint Eastwood and Morgan Freeman, then the ball starts rolling,î Clooney told us. ìEveryone we called, literally unless theyíre going out of the country, is going to be here. The list of people is insane.î

Clooney's very-public invitation to Bill O'Reilly was even a success. ìExtraî broke the news about Clooneyís now-infamous letter to OíReilly, in which he challenged the TV titan to put his money where his mouth is. George told us he hopes all will be forgiven Saturday night. ìWe're thrilled that he's here, and we hope he brings his fan base and people like that get involved,î Clooney insisted.

NBC/Universal Chief Jeff Zucker told our Tanika Ray that there are so many stars packed into the show that the network will actually be working overtime to get them all in: ìOriginally it was one hour, but there was such an outpouring of support and so many people that wanted to be a part of it that we expanded it to two hours.î

ìApprenticeî star and soon-to-be groom Donald Trump has even asked wedding guests for his nuptials next week to forgo gifts and give to the cause. ìHeíd prefer that you just give money to the Red Cross to aid tsunami relief,î Zucker revealed.

As for the format on Saturday night, Clooney said they'll go with what worked after 9-11: no host, just celebrities presenting stories and performing. And with any luck, they will raise some much-needed money. ìAll itís about is saving lives,î Zucker said.