Advertisements I enjoyed part 1 (2 if you count Supergirl episode) of the crossover. It wasn't what I thought it would be, which is a good thing. If you don't watch all three shows there will be some confusion as some of the dangling plot threads from the other two shows (especially Legends) were resolved in the Flash episode, but that's been the case anyway from time to time. I'm assuming the same thing will happen in the other two crossover episodes. One thing I will say is Supergirl was a lot stronger in this episode then she is in her own series where she's routinely beaten up by cyborgs, other aliens, humans with alien guns and other adversaries she should easily crush. She was much more "super" in the Flash episode able to take out all the heroes in training without breaking a sweat let alone moving.