The Mane Five discover the downsides of being Equestrian heroes.

Right before she sends the letter to Celestia that will end in her being sent to Ponyville, Twilight accidentally time travels. To the future.

During the events of Magical Mystery Cure, Twilight asks her friends how each pony got their new (new to Twilight, at least) cutie mark.

The story of how the young filly Rainbow Dash learned about the Rainbow Factory.

Pie Hater Dash returns... and has a vengeance against Pinkie.

Equestria gets invaded by the Borg.