Rainbow Dash has never mentioned a brother -- and for good reason: Stormdrift is a shy, cheerless stallion known best for living in his Wonderbolt sister's shadow. After being forced to move from Cloudsdale, Stormdrift refuses most social contact -- until Pinkie Pie forces herself into his life, intent on cheering up the stallion the best way she knows. However, when Pinkie learns that parties and mounds of sugar cannot soothe every tear, she dedicates herself to learning what true joy really is -- but the answers she finds are not at all what she expected.