Starlight knows she's not supposed to travel back in time. But when Starlight's been drinking she tends to forget things.

Now she and Spike are trapped in the past with no idea of how they got there or how to get back. Holding out hope that Twilight or someone else will rescue them they work hard to not cause any changes to the timeline. Or at least that's what they should be doing. Starlight Glimmer might have some other ideas.

On a particularly normal morning, Twilight Sparkle learns that Starlight Glimmer has been up to time-altering shenanigans again. She claims that she had to stop Rainbow Dash from performing another Sonic Rainboom in order to save Ponyville from catastrophe, but Twilight had seen enough to know how important Sonic Rainbooms are and how Starlight should absolutely never try to stop one ever again. The future of Equestria could depend on it, after all.

However, Twilight's attempts to fix Starlight's meddling only seem to make things worse. So do her attempts to fix her own previous attempts. As well as her attempts to fix those attempts...

Perhaps Starlight had been onto something.