I Heard a Voice is the first live DVD from AFI that was released on December 12, 2006. The concert was filmed at the Long Beach Arena in Long Beach, California on Friday, September 15, 2006. Part of the Decemberunderground Tour, the crowd was the largest AFI had ever headlined with over 13,000 people in attendance. The title of this DVD is lifted from a line of poetry in the decemberunderground CD booklet. Underneath the song 37mm, it says: "The power went out. I turned on the radio. The power went out. I turned on the radio. The power went out. I turned on the radio....I heard a voice." The moth on the case is also from the decemberunderground booklet.

An actress’s perception of reality becomes increasingly distorted as she finds herself falling for her co-star in a remake of an unfinished Polish production that was supposedly cursed.

In a distant future, a cult forms around the Manson Family, when Charles Manson is mistaken for the messiah. Meanwhile, in 1969, Manson convinces his followers to murder Sharon Tate.