Earth (or The Other Side) is an alternate universe that lies on the other side of The Gate. This realm appears exclusively in the 2003 anime.
In Episode 50, Edward Elric first appeared on Earth after Dante uses Rose 's child to summon The Gate and forced him on the other side. Upon awakening, Ed found himself in London, where he encounters Hohenheim of Light and finds himself in the body of his parallel counterpart. Hohenheim reveals that the souls of those who die in this world are transformed into energy for Amestrians to use Alchemy. Meanwhile, both Ed and Hohenheim watch as the city is in chaos, with Zepplin's bombing the area, that cause debris to land on Ed, his counterpart dies, causing Ed to return through The Gate back to Amestris.
In Episode 51, Edward is once again transported back to Earth as the price for resurrecting Alphonse. Ed and Hohenheim were living together but later went their separate ways on a journey to find a way to return to Amestris: Ed aspires to learn about rocket science, whereas Hohenheim plans to seek out Winston Churchill. During Ed's train ride to his next location, Ed reached his hand out the window and vowed to one day reunite with his brother.
Earth has a more prominent role in Conqueror of Shamballa, where the main antagonist Dietlinde Eckhart and the Thule Society aspire to reach "Shamballa" after gaining the knowledge from Hohenheim. At the end of the movie, Edward (and Alphonse, who stowed away inside a suit of armor) decide to leave Amestris behind to destroy The Portal from the alternate side of The Gate and settle in this world.
As stated by Hohenheim of Light, this realm relies more on physics and machinery than alchemy, because of this, any special abilities an Amestrian has (via Ed and Hohenheim's alchemy, or Envy's shape-shifting) are nullified. However, it appears that an Amestrian can use some form of alchemy (usually in an attempt to open The Portal) with their blood - although, this could also be attributed from the unknowing assistance from someone else in Amestris (like Alphonse).
Aside from the lack of alchemy, the realm of Earth at the time possessed Bi-planes, Airships, Zepplins, Pistols, Suits of Armor, the Spears of Longinus, Vehicles, along with other equipment to function.
- Edward Heiderich (deceased)
- Alfons Heiderich
- Officer Hughes
- Gracia the Florist
- Fritz Lang
- Erik Jan Hanussen
- Adolf Hitler
- Dietlinde Eckhart
- Karl Haushofer
- Rudolf Hess
- Many fans have used the term "Our World" to describe Earth.
- It's stated that anyone who crosses over The Gate to Earth with their mind, body, and soul intact will find it next to impossible to return to Amestris as alchemy does not work on Earth.
- Although they never made an on-screen appearance, both Edward and Hohenheim confirmed Albert Einstein and Winston Churchill's existence in this world.
- The Elric family (including Envy) are the only amestrian natives by far to have crossed over to this realm, albeit for differing reasons
- Hohenheim - Banished there by Dante using Rose's baby as a catalyst to open The Gate.
- Edward - Formerly banished there by Dante until returning, but was later sent there as a price of resurrecting Alphonse.
- Envy - Forced his way through in a desperate attempt to murder his father.
- Alphonse - Stowed away in one of his old armors, to live there with Edward.
- Another thing to note is that they either settled in this realm (Ed and Al) or died in this realm (Hohenheim and Envy).