It's supposed to be an homage to those old school action movies, like "Mad Max" and "Duel". The band is racing across the desert, probably trying to get to the ocean so they can then go to Plastic Beach.
The Boogieman, the dark caped being wearing the gas mask, is the bad guy for Phase 3 and he engulfs the policeman's soul.
Bruce Willis is a bounty hunter who is probably after Murdoc to repay a debt या something. Murdoc steps on the gas to lose him, but they reach the ocean quicker than they expected and fall into the ocean. There car then turns into a submarine and they head off to Plastic Beach. (see "On Melancholy Hill" to continue the story)
