What if the only people left alive in the world were Southern California teenagers? That's the start in this campy, enjoyable sci-fi tale of two sisters who must fend off zombie-like mutants and mysterious scientists after a comet's passing exterminates nearly all life. Catherine Mary Stewart, Kelli Maroney, Robert Beltran, and Mary Woronov star. 95 min. Widescreen (Enhanced); Soundtrack: English; Subtitles: English; audio commentary; interviews; theatrical trailer. Two-disc set.