Chapter 1- It begins

Kara and the heroes of earth-38 are faced with a threat like never before. What will happen when tragedy strikes and Kara's super-friends from earth-1 must come and help take down a monster?

This story will include characters from Supergirl, Flash, Arrow and Legends of Tomorrow all of which I own NONE of the rights to. Just putting that out there. Also I've never written a longer story like this or written a summary before... Anyways this story will have some swears in it but nothing too bad, I would recommend 13+, just cause there's descriptions of blood and injury along with a couple minor curse words.