Episode List: http://mlp.draconequus.com
With Rarity engrossed in work, Fluttershy offers to watch over the Cutie Mark Crusaders for the night. She finds the fillies to be rambunctious and hard to control. At night, the Crusaders find that one of Fluttershy's chickens has escaped into the Everfree Forest, and they go out to retrieve it. Fluttershy soon discovers them missing and follows the hoofprints of the Crusaders; she eventually comes across the petrified form of Twilight Sparkle and her chicken, and realizes that a cockatrice is around. She finds the fillies and warns them of the danger, but they soon come face-to-face with the cockatrice. As the cockatrice starts to turn Fluttershy to stone, she gives it an intense stare and demands that it reverse its spell. The cockatrice eventually relents, negating the petrification of her, Twilight, and the chicken, and disappears; the Crusaders cheer for Fluttershy and call her the "Stare Master". The next morning, Rarity comes to retrieve the Crusaders, and is surprised that they quickly fall in line with a simple request from Fluttershy.
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22:01 MLP-FiM S1 E17 - Stare Master