My Little Pony: Friendship Is Magic: Season 4, Episode 20

4 - 20: Leap of Faith

The Flim Flam Brothers' cure-all tonic promises Ponyville citizens a chance to be rid of their ailments. Applejack has her doubts about the merits of the tonic, until Granny Smith begins taking it and appears to be cured of all her aches and pains.