Twilight wants to learn a new spell and, with the persuasion of an over-eager Spike, finally chooses Hypnosis. The test subject? Rarity. But after the spell goes terribly wrong, Twilight and Spike must deal with the side effects. What are the side effects? Well, it consists of the six ponies falling in love with Spike. Now they just have to find out what went wrong, of course, while avoiding the love-struck ponies that is.