1. Goodbye Supergirl

Few things are more terrifying than being called to say your goodbyes. Specially when someone you thought was invincible is the same person you're saying goodbye to.
Barry is called to say his goodbyes to his best friend: Kara Danvers. After the chaotic fight against Reign, the Girl of Steel is brought to her knees along with Barry Allen. A distraught Flash refuses to accept that there's nothing to be done for Kara and decides that she doesn't get to die. Not on his watch at least.

Disclaimer: I do not own these characters. DC Comics and the CW does.