Welcome to Five O’Clock Video, our choice for the day’s best musical video—every weekday at 5 p.m. EST.

When "American Girl" singer Bonnie McKee isn't writing hit songs—she's got eight No. 1's (!)—or dreaming about Eminem, she's fighting zombies. Or at least that's what she's up to in the music video for her uber-catchy new song "Sleepwalker." Watch the vid, and beware of "soul-sucking viruses."