Starlight Glimmer, being a rather impatient pony, tries an expert teleportation spell. A horrible glitch in dimensions happens when she uses too much power in her spell, which causes a dimension to slowly glitch into the other. Starlight only realizes this when she sees two odd-looking twin ponies. Starlight and the two ponies need to find out how to rescue both their worlds before they collide horribly with one another.