Board Thread:DC's Legends of Tomorrow discussions/@comment-9346948-20161118002413/@comment-3423279-20161119025911

Xandermcc wrote: Kaestal wrote: Xandermcc wrote: How do superheroes from 2016 contact time travelling superheroes? Barry went to 2056 and figured out how to do so from his future self.

Or, they looked in time and realized "Oh crap, we need to help them with this" Maybe the Dominators are an abberation? If they are from Earth-Supergirl it is a possibility.