Behind the Scenes of Michael Jackson's 'This is It' Concert

Michael Jackson was busy putting on the final touches for his 50-date London concerts at the O2 Arena when he unexpectedly died. Now, ET's Thea Andrews is with the men behind the massive production to reveal what could have been Michael's most incredible concert tour yet!

A show filled with music, dance, stunts and pyrotechnics, Michael's "This is It" concert was being directed by Kenny Ortega, the man who designed Michael's "Dangerous" tour, choreographed 'Dirty Dancing' and also brought "High School Musical" to the world. Kenny says that Michael promised "the concert of a lifetime" and was prepared to deliver.

"We [had] some fun things planned," he says, referring to gigantic spiders, 20-foot puppets, a flaming bed, a pole dancing aerialist, a 3D movie and plenty more magic. "It's complex in scale and it's as big as anything I've ever done or attempted to do for an arena production."