Jaafar Jackson has lined up his first major role following his breakout performance as his uncle, Michael Jackson. Fresh off the massive success of "Michael," which became the highest-grossing biopic of all time, Jackson has joined the cast of the upcoming action thriller "Supermax." He'll star alongside Will Smith and AnnaSophia Robb, although details about Jackson's character are being kept secret. Producers say his role will be central to the story, which follows two FBI agents investigating what appears to be an impossible murder inside a maximum-security prison.