may 10, 2016 - Barry Allen from Earth-1 accidentally arrives on this Earth in time to save Kara after an attack. He helps her defeat Silver Banshee and an escaped Livewire before she helps him return to his universe. This begins a working relationship between the two. (Earth-38)
Added to timeline:
Date:
may 10, 2016
Now
~ 9 years and 5 months ago