ABC, which is slogging through another year of lackluster ratings, is planning to revive the show that rescued it when it was last in a ratings bind ten years ago -- Who Wants To Be A Millionaire . The network said Wednesday that it will air a two-week Millionaire "tournament" in August, once again featuring Regis Philbin as host. The quiz show, which launched in 1999 and at one point regularly drew around 29 million viewers, lasted in primetime only three years, with season-to-season audience erosion blamed on overexposure. But the show has continued in syndication and remains a staple in primetime in other countries. (The Indian version was featured in the Oscar-winning film Slumdog Millionaire .)