All Nightmare Long... You can't even escape through sleep

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The music video directed by Roboshobo debuted on December 7, 2008, on Metallica.com and Yahoo Video.The video depicts fictional Soviet newsreels about the infamous Tunguska event in 1908. At the impact site, spores of an unknown species are discovered that can reanimate the dead. The Soviets exploit this as a weapon to turn the tide in a war against nuclear America, creating a zombie apocalypse over the nation.

In an interview, James Hetfield commented on the song's lyrical meaning:
“ It was an attempt to get back to the H.P. Lovecraft mythos with Thing that Should not Be, Call of Cthulu. This was about the hounds of Tindalos, which was another crazy mindfuck about these wolves that hunt through their nightmares and the only way you can get away from them is stay with angels. You can't even escape through sleep. ”