Equestria has expanded its borders to other planets. Other life in the universe has been discovered. However, these life forms are not friendly. The race of equine aliens known as the Arach seek to wipe the Equestrian race from the face of the galaxy. And so, the Equestrian Colony Defense was established.

Join Cosmo, a young colt who was unwillingly drafted into the ECD, as he ventures into the vast unknown of space.