The World Heavyweight Title is a title on the Smackdown brand in Smackdown Vs Raw 2006, Smackdown Vs Raw 2007, Smackdown Vs Raw 2008. It is the main championship of Smackdown, and one of the two world titles (three in Smackdown Vs Raw 2008) in WWE. Batista, Rey Mysterio, and Edge are the default champions in Smackdown Vs Raw 2006, Smackdown Vs Raw 2007, and Smackdown Vs Raw 2008 respectively.
The title is the world championship for Smackdown, so only people in the top five of the Power25. The only four people can fight the champion (8 if they're all teams in teams). The competition is small, but only the best superstars of the brand are able to compete for it.