Earth is the third planet from the Sun in our Solar System, located in the Milky Way galaxy. Earth is home for human race.

Earth was contacted by Unnamed Alien Species in 1994, who had received the Earth's transmission sent to space by SETI. SETI received two messages from the aliens. The first message contained a more efficient use of methane, while the second contained a DNA sequence along with directions on how to mix it with human DNA. Humans went ahead and performed the fusion of the DNAs, and the first incident of the hybrid happened.

In 1998, astronaut Patrick Ross and the Excursion crew brought the alien infection to Earth from Mars, which had been destroyed by the Unnamed Aliens billions of years ago.