Overview: In the first semi-final, eight acts are drawn against each other in a series of dance battles. From crews to solo dancers, mistakes mean instant elimination and the pressure is intense as they are dancing for just two places in the live final. Deciding who makes it through are the judges - Jamelia, dance casting agent Mark Summers and Michael Jackson's brother Jermaine. At stake for the ultimate winner is a once-in-a-lifetime prize - dancing at Michael Jackson's memorial event in 2010.