As the title promises, we finally get our long-awaited introduction to Sue Dearbon, played by Natalie Dreyfuss as the perfect sarcastic, brainy, adventurous match for Ralph, at least until she inevitably (and no doubt temporarily) betrays him.

Sue is the missing person Ralph has been consumed with finding since at least the end of last season, and when he finally tracks her down to her recently rented apartment in Central City, it’s just in time for a bomb to go off.

Sue claims to be hunting down her ex, an arms dealer named John Loring, and she enlists Ralph into her plan of gathering enough evidence to nail him.

If the comics are our guide (and they aren’t always, necessarily), this is only a temporary setback, but even after Ralph saves Sue again by stretching his hand into a giant bulletproof shield, she still takes off with the diamond.

This week also brings our introduction to Eva McCulloch, presumed dead for six years but actually another victim of the particle accelerator explosion that blasted her through a mirror and into an unpopulated dimension.

We do know that she wants to get her hands on the mirror gun, something Barry doesn’t think is a good idea until Joe lets him in on a series of crimes that all appear to tie in with McCulloch CEO (and Eva’s ex) Joseph Carver.