THE WALLY/WHO BALLYHOO

In that same episode of 'The Listener' ("Iris"), Toby Logan and Oz Bey helped out an old derelict named Wally. As he rested up in a hospital bed, Wally expressed regret that he never got the chance to see the sky catch fire.

I'd have to assume then that Wally was passed out drunk when a Gallifreyan Time Lord - known as The Doctor - burned off the poisonous gasses in the atmosphere, which had been triggered by the Sontarans and the ATMOS devices in every car.

(from 'Doctor Who' - "The Poisoned Sky")

BCnU!