The Eleventh Doctor and Amy Pond arrive in London some time in the 21st century. They are having a nice cup of tea when they notice the latest fashion seems to be jackets with shades — lots of them! Accessing the local Wi-Fi network, the Doctor, using his sonic screwdriver, detects a massive surge of data that triggers a bio-molecular transmogrification of the jackets, engulfing and trapping the people inside them. With control lost, the Fliis symbiotes engage emergency teleport and leave. Some time later the streets are full of bow tie-wearing people.