The Blitz

The Blitz refers to the bombing of the United Kingdom by the Germans during World War II. The Blitz primarily focused on London.

Effects
The Doctor and Richard Lazarus both witnessed the Blitz. As a child, Lazarus would take shelter in a nearby cathedral while the Germans bombed. (DW: The Lazarus Experiment)

An Auton duplicate of Rory Williams rescued the Pandorica from a fire started by the bombs. (DW: The Big Bang)

At 8:47 p.m. on 12 October 1940, the New Regency Theatre, owned and operated by the late Henry Gordon Jago in the 1890s, was destroyed, as was the hotel next to it. (JAL: Swan Song)

In 1941, the Kiss the Boys Goodbye Dance at the Ritz in Cardiff was briefly interrupted by nearby bombings, forcing the attendants to take shelter. (TW: Captain Jack Harkness)

Alien activity
In 1940, Cybermen landed during the Blitz and used it as a cover for their activities. (PDA: Illegal Alien)

The Eleventh Doctor and Amy received a phone call from Winston Churchill asking the Doctor to come to World War II-era London. On arrival, they found the Daleks pretending to be mechanical soldiers known as "Ironsides" for the British. During the London Blitz, the Daleks sent an electrical wave that turned on all electronic devices, making London light up. (DW: Victory of the Daleks)

The Empty Child plague began during the Blitz. When street children ran into empty houses while the owners had run into shelters, the Empty Child would knock on the doors and ring telephones. When Rose went to help the child, she was caught on a zeppelin rope and was hoisted over London. (DW: The Empty Child / The Doctor Dances)

Time travel
Time Agent "Captain Jack Harkness" arrived in London. He took the name of a deceased American volunteer in the Royal Air Force, as part of a con. (TW: Captain Jack Harkness)

As a result of time breaks, a British spitfire and a German Messerschmidt were transported roughly fifty years back in time and appeared in the sky over 1890s London, where they continued their fight. This was witnessed by Jago, a native of that era, and Leela. One of the planes was severely damaged and its pilot parachuted out of the plane. Jago, never having seen either a "flying machine" or a parachute, suggested to Leela that he should hire the pilot to perform his "act" at the New Regency Theatre. (JAL: Chronoclasm)

Behind the scenes
The London Blitz appears in the online game Doctor In A Dash as the setting of Level 4 where, as with all levels, the Doctor's TARDIS (the player) races against a Dalek Flying Saucer, a Judoon rocket, and a Slitheen craft to find a Space-Time Manipulator. Barrage balloons act as obstacles to the ships.