Earth

It should be clear what planet Earth is. Home to mankind, in a time of technological advance. Earth is also the home planet of Lord British, the Avatar and the eight companions (with exception of Shamino). However, Earth iself plays a minor role in the series. It is only seen in the intros and end sequences of the games

In Ultima II however, Earth is the central place of the game. Minax had manipulated the timeline, resulting in a totally changed past, and in the end, Earth was destroyed by a nuclear holocaust in 2111 A.D. The Stranger tried to repair the damage to the timeline, traveling to these periods of time, which were totally changed by Minax' meddling:


 * Pangea- 200 mio B.C.
 * 1423 B.C.
 * 1990 A.D.
 * Aftermath- 2112 A.D.

In the end, the time line returned to normal, and all these events had never happened, apart from the memories of the Stranger.

The only other game where Earth is part of the game itself is Ultima IX, but many consider this part to be non-canon, and it actually made no sense that the Avatar was on Earth at the beginning.

Places
During the time twisting, there were three places of interest, besides the castle of Lord British:


 * New San Antonio in 1990 A.D.
 * Pirate Harbour in 2112 A.D. Aftermath
 * Port Benefice in 1990 A.D.

Trivia

 * The coordinates for Earth in Ultima II are 6,6,6.
 * The valley of Eodon is actually on Earth, but totally out of phase, so it can be only reached with the Orb of the Moons.