Twilight Sparkle is turned to stone (offscreen) by a cockatrice in the Everfree Forest. Her shocked expression suggests that she was caught by surprise. A few hours later, she is accidentally discovered by Fluttershy. The Cutie Mark Crusaders later find a snail slithering over her petrified form.

Fluttershy encounters the cockatrice herself a short while later. It attempts to petrify her, but only partially succeeds, and Fluttershy is able to intimidate it with her own special Stare, which nullifies the petrification on herself. After a harsh talking-to, the cockatrice is scared enough that it returns Twilight Sparkle to normal. Twilight appears dazed and has no memory of what happened while she was petrified.