LOS ANGELES, Sept 21: “Game of Thrones,” HBO’s blood-splattered fantasy series featuring dragons, castles and warring families, is turning into a franchise for the premium cable channel that may rival its biggest hit, the mobster drama “The Sopranos.” Like “The Sopranos,” “Game of Thrones” has become a revenue magnet for the Time Warner-owned cable channel, attracting licenses for T-shirts, games, even its own line of beer. (agencies)