The Doctor and Jo are relaxing after having taken part in peace talks on Earth. They attend a re-enactment of the Battle of Britain, which is disrupted by a group known as Pull Back to Earth. After the demonstration is over, the Doctor and Jo follow the crowd to the exit, and are nervous that guards are checking everyone's PANs. They try to bluff their way out, but the guard doesn't fall for it, so the Doctor karate chops him and they run away.