One day, Rainbow was looking after a precious gem that Rarity had. Rarity had to go and collect more patterns for her new dress that she was taloring for the Grand Gala, so she asked Rainbow Dash to look after it for her. That day, Rainbow Dash lost the gem and found out that a mysterious force had taken it! On her way to find it, she enconters a strange pegasaus on the way and she partners with it. Together, they go on an adventure like never before! But, they better hurry! Rarity is coming back that day! Will they find it in time, or will they have to find a new gem?