In the distant future of Equestria, after a millennium of Princess Twilight Sparkle's rule, there's a filly under the name of Trixie Lulamoon.

At first, she didn't know what having that name implied. Till one day, when her family's legacy will catch up with her. She will find out what does having the Trixie name means. She will find out who was this "Great and Powerful" Trixie with whom she shares her name.

Only one pony really knows the truth, and is not who Trixie would expect.