Pinkie Pie has just admitted she killed Lyra! But she also said Rainbow Dash helped her. Rainbow Dash admits it because ever sines the rainbow factory incident she needed flesh and blood. A couple days later Diamond Tiara had died at the hands of the two killers. The CMCs would be happy if Scootaloo hadn't gone missing. Every pony is worried even Rainbow Dash. So she sets out on a journey to bring her back. But along the way she meets Soar a pony who she recognizes but does not remember. But then they get captured by a foe they thought they would never see
QUEEN CHRYSALIS !!
And her changeling army. Now Rainbow, Soar, and Scootaloo have to escape before they become changelings themselves.