The Summer Solstice is fast approaching, and everypony is gearing up for the annual celebration. But everything is threatened when Braeburn arrives in Ponyville with terrible news. A swarm of Cries O'Melody Beetles is sweeping across Equestria. It is eating all the vegetation everywhere it goes. And according to Twilight, no such swarm has ever been stopped by ponykind. But another erudite pony, Bookkeeper, suggests that Hedgehogs may be the key to stopping the advancing swarm. Twilight, Fluttershy, and Bookkeeper venture into the Everfree Forest to acquire a sounder of their own, save Equestria, and keep the celebration on track.