My Little Pony: Friendship is Magic (Comics)

My Little Pony: Friendship is Magic is an ongoing Hasbro-licensed series of full-color comics. It consists of original story arcs set after the second season of the show.

Friendship is Magic #23
A Kelpie named Cassie hypnotized all the ponies on ponyville to work for her in order to help her friends.

Friendship is Magic #48,#49,#50(Accord Saga)
The Mane6 get mad with Discord, so he decides to change to become less chaotic, transforming himself into Accord, but Accord is so "perfect" that he wants that everypony becomes like him, so he mind controls everypony except for Starlight Glimmer.