"Hello, I'm the Doctor. And, if you can hear this, then one of us is going to die."

At the bottom of the sea, in the wreck of a floating radio station, a lost recording has been discovered. After careful restoration, it is played for the first time - to reveal something incredible. It is the voice of the Doctor, broadcasting from Radio Bravo in 1966. He has travelled to Earth in search of the Hush - a terrible weapon that kills, silences and devours anything that makes noise - and has tracked it to a boat crewed by a team of pirate DJs. With the help of feisty Liverpudlian Layla and some groovy pop music, he must trap the Hush and destroy it - before it can escape and destroy the world...