Earth is the home planet of all humans in the Raiden series (but doesn't appear as the multi-level carrier in Viper Phase 1).
Role in the Raiden seriesEdit
Earth is mostly the planet with many levels in the Raiden series, which in Raiden II for example, carries five stages before the Raiden mk-II and Raiden mk-II ß blasts off into the outer galaxy to finish off the Cranassian invaders (which is the final three levels).
Main series: Earth is the standard world of the main Raiden games, in which it carries a big proportion of the game's levels.
Raiden Fighters series: Earth contains every single level in the Raiden Fighters series, and no space sequences appear (the only high levels is usually inside Earth's atmoshere at a high range).