My Little Pony Friendship Is Magic Season 5 Episode 15 Rarity Investigates! Episode Title:Rarity Investigates!.Episode Description:Rainbow Dash is accused of sending Spitfire away on a fake errand to replace her in a Wonderbolts aerial display and fly alongside her idol Wind Rider. Seeing this, Rarity investigates the crime to prove her friend's innocence, but her constant habit of acting out a film noir mystery makes Rainbow Dash doubt her. Eventually, Rarity is successfully able to identify the true culprit as Wind Rider, who confesses to framing Rainbow Dash in order to protect his flight speed record. Spitfire then discharges Wind Rider from the Wonderbolts as punishment to which Rainbow Dash is allowed to take his place in the display.