Thunderzolt is the first victim of TraderJack, a villain who traps the souls of ponies into playing cards. When Thunderzolt's card is found, panic arises in the small town of Ponyville. One by one, more ponies start being turned into cards, and the remaining ponies have to figure out what's going on and how to stop TraderJack from harming any more ponies... and how to retrieve the ponies that were already lost.