who is worth the most? we break down the forbes list of the most valuable stars. so, who is number one? announcer: from the global resources of abc news, with terry moran, cynthia mcfadden and bill weir in new york city, this is nightline, may 20th, 2011. good evening, i m cynthia mcfadden. we begin tonight with the end of the world. right now, thousands of people across america are literally preparing to meet their maker before the sun sets tomorrow. then there are those who think that life as we now it is going to end not tomorrow, but next year, in 2012. a date associated rightly or wrongly with the ancient mayan calendar. so, what drives doomsday theories. why do people believe them? here s david wright. may 21st, judgment day. reporter: they believe with all their hearts in the word of god. god bless you. reporter: so much so, they see themselves as characters from the bible. we are the watchmen. the watchmen for the lord god almighty. reporter: the wat