Conditions arise that cause two different dimensions, vastly different, to cross inhabitants over to the other world. Now they must find a way to get back before it is too late.
Do you use the human tag if they're human-shaped but not human? :?
This is a crossover with Homestuck. If you have not read the web comic yet, I'd suggest that you do so before reading this. If there are questions about this, I'd be happy to answer them.