Sixty years before Celestia and Luna became the joint rulers of Equestria, a tribe of creatures terrorized other creatures in the name of the Winged Terror, the Wyvern.

Fast-forward to the present day. An earth pony historian by the name of Golden Plate is visiting Fillydelphia for some information, when he is crashed into by Dream Chaser, a pegasus archaeologist. Dream Chaser invites him to her expedition for the Griffon Emperor. But what will Golden Plate and Dream Chaser find on this trip?