The BBC said Tuesday it had launched an inquiry into how a new episode of cult British TV sci-fi series "Doctor Who" has been leaked on the Internet.The classic program, which has been off air since 1989, makes a much-anticipated return to the small screen later this month with Christopher Eccleston starring as the time-traveling hero and former pop star Billie Piper as his sidekick.
However, the BBC -- which was due to trumpet the show's regeneration at a celebration launch Tuesday -- said one of the 13 new 45-minute episodes had been posted on the Internet.