Scootaloo finally gets her mark and is having a huge party to celebrate it. Dash is supposed to show up but when a situation comes up she has to a skip the party. Scootaloo is deeply hurt and reflects on Rainbow Dash's egoistical personality. She decides that Iof her own adopted sister is not important enough for her then she can find another one. She encounters Dash's old rival Lightening Dust and the two set out to become. RD's worst nightmare.