The rig gets stuck, and a Britannian soldier mistakes Lelouch for a terrorist. Luckily, he's an old friend, but before they can get reacquainted, the stolen capsule opens.
It contains, not poison gas as rumored, but a girl.
The soldiers who arrive get it all wrong.
We open with an alt-history voiceover.
In 2010 (slightly into the future when this was released,) the Holy Empire of Britannia (shown as all of North America on the map,) declared war on Japan.
Their war Mechs, the Knighmare Frames, defeated Japan's conventional forces.