At the changelings Masquerade Ball, Starlight has to face her feelings and figure out the identity of another - all while transformed into a great and powerful friend. Who is the other pony and why did they pick Starlight as their disguise?
When Princess Celestia comes down with a mysterious illness, Sunset takes it upon herself and Twilight to get to the bottom of it, which would be hard enough if she wasn't dating the other Twilight in secret.