Alex Danvers learned early on when there's no one you can talk to about your crazy train wreck of a life, alcohol dulls the ache. Old habits die hard. Some nights she needs something to take the edge off. It's not a problem...until it is.

The fundamental problem with evidence-based conclusions is that they are not bulletproof. In the lab, scientists do their best to control the environment for their experiment. In the real world, variables that one may not have even been aware of change. When that happens, everything you thought you knew may prove to be wrong. There are benefits to having Supergirl on the payroll.

Eight months after her sister's death Alex Danvers wakes to find Supergirl in her kitchen.

"Don't do that again. There was nothing I could do Kara. Where you went, I couldn't follow. I hate feeling so...so helpless. You're so important to me."

Early this morning, Supergirl saved National City. She didn't make it home.