Set during the events of Welcome To Canterlot High, Scottish Twins Donald & Douglas get caught up in a secret mission when Agents Lyra and Sweetie Drops travel to Sodor in search for a mysterious creature mistakenly brought to their world. Now appointed unofficial members of S.M.I.L.E., the four agents embark on a mission to return the creature back where it came from, as well as save their home from a menacing criminal with intentions to use said creature and many more to conquer Canterlot.

It's a story of putting your trust in others, loyalty, adventure, and high thrills in a world of secret agents, monster busting, and dimensional travel.