In a sequel to "Princess," the reborn young alicorn mare Rainbow Dash must save her family from the hands--yes, hands, not hooves--of a race thought long extinct. If she doesn't, not only will the royal family be killed by advanced technology that can destroy even the immortal alicorns, but this race will exploit the power of the alicorns and Doctor Whooves' TARDIS to take over all space and time.