Episode Title:
MMMystery on the Friendship Express.
Episode Description:
Pinkie Pie is in charge of guarding the Cakes' dessert for a competition in Canterlot. She and her friends share the train with three rival bakers who have brought their own entries. Overnight, the Cakes' dessert is partially eaten. Pinkie immediately accuses the other bakers, but Twilight instead shows her how to investigate, and finds clues that point to their friends, Rainbow Dash, Fluttershy and Rarity, each admitting to taking a taste. The other bakers' desserts are similarly eaten, but Pinkie, using Twilight's advice, deduces the bakers had eaten each others' desserts after hearing Pinkie's delicious descriptions of them. The collected group use the remains of the desserts to create a single entry that wins the competition.
