Dragons and the world beyond their own

What if a unknown visitor from another universe visit the rescue riders.What will happen if after that they discover berk and hiccup and the gang.What would happen if they discover a world of dragons none of them have ever seen before.
Read to find out who the unknown visitor is,where they from,what will happen when the two dragon rider teams meet and so much more.

I don't own any of the httyd,rescue rider,paw patrol,or any other shows or movies I might add in here.I only own my ocs and then ocs from comments go to their respected owners.