and the world appeared ready to welcome him back. it had been 12 years since jackson's last major performance. the king of pop was poised to regain his throne. >> this is it. this is the final -- this is the final curtain call. >> according to the contract with concert promoters aeg, michael was to perform 50 concerts at the o2 center in london over a nine-month period. >> i'll be performing the songs my fans want to hear. >> but was michael physically up to the challenge? both michael and aeg had a lot on the line. >> it was his comeback. it was his renaissance, his rebirth on stage. after so many years of being out of the spotlight, a lot of people were wondering if he could pull this off. >> this is it, and see you in july. >> but there were questions