When ponies in Fillydelphia begin to turn to stone overnight, two young fillies and two young colts (Alexis Aegis, Sharp Gaze, Blu Triumph, and Brazen) come together and show their adventurous side, deciding to investigate.
Brazen heads to the local library in hope of find what the cause of this might be. His search ends with only one possibility: a Cockatrice was loose in their town.