Written as an alternative take on the Season 4 Finale, the reason being we never saw the Crusaders' in the episode.

Following the events after Tirek's defeat against Princess Twilight and her friends, a headcount of all ponies local to Ponyville have been taken, yet there were three missing from those numbers: The Cutie Mark Crusaders.

With the note of this information, the Mane Six fan out to form a search party for the young girls, hopefully with a positive outcome on their whereabouts. For Applejack, Rarity and Rainbow Dash, the news hits a whole new tone of worry for their sisters.

ADDITIONAL NOTICE(S)
Tragedy tag because of the themes/atmosphere of the Season 4 Finale
OC tag because this is still with the same, non-altered characters we see in the actual episode but the catch is that they are searching for their missing family members after the attack on the town.