For Lyra's first "proper" trip in the TARDIS, she wanted to see one of Equestria's starships. But as the TARDIS crew lands on the ship, they get a not-so warm welcome. What's worse, a temporal distortion hurtles the starship back in time and out-of-control! With less than a day on their hooves, the crew of the starship and the crew of the TARDIS must work together to get the ship working again, or risk being stuck in the Late Cretaceous with flesh-eating dinosaurs!