Supergirl S2E19

Thoughts:

• I think the juxtaposition of Maggie's level head and cautiousness to Kara's leap before you look is interesting and sets up a kind of conflict between the two. 
• Turns out that Rhea is tryin g to set up a transport portal like we have seen before this season and is trying to use Lena to help her build it.
• Alex has been kidnapped and the kidnapper wants Kara, who he knows is Supergirl, to free his father Peter Thompson  from prison and is prepared for team Supergirl and their tricks.
• Lena is smart and figures out that Rhea is an alien and refuses to help her build her device and throwback to early this season when she used the alien detection device on Rhea.
• Maggie was the one to rush in and try to break Peter out of prison and Kara, after seeing the error of her ways, is the one to talk to Peter and get Alex's location from him.
• In the end Lena decides to work with Rhea and doesn't check in with Kara who would have told her that Rhea is bad news.

Predictions:

• Rhea is going to use this portal to bring in aliens and reinforcements from across the galaxy to start a war in National City.
• This all makes me really think that in the end it is going to be Lena and Rhea against Supergirl and Cadmus or at least until Lena realizes that Rhea is trying to get rid of Supergirl
• I think Lena is going to learn that Kara and Supergirl are the same person in the season finale and set up her role for next season