This story is a sequel to Crossed Gears
It seemed like a good idea at the time. Open a rift, push the Other through, and then go back. But of course, nothing ever goes to plan. Can't keep a magical rift open when there's no magic in the world. Now Copper has to figure out how to get home using anything he can.
What is this a crossover of?
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Uh...not really anything? I mean, there's some Doctor Who nonsense thrown into the stories, but that's about it.