Aliens reinvaded America's living rooms again Tuesday night -- en masse. According to overnight Nielsen ratings, ABC's V attracted 13.9 million viewers, providing some unexpected competition for the usual winner of the 8:00 p.m. time period, CBS's NCIS. It was the best premiere for a new scripted series this year, beating The Cleveland Show and NCIS: Los Angeles. The alien-invasion series is based on two miniseries that aired on NBC in 1983 and 1984. NCIS, meanwhile, may have lost 11 percent of its viewers from its last original episode two weeks ago, but it still performed strongly, averaging 19.4 million viewers, well ahead of V.