Especially because the show didn’t find any real motivation for Kara’s breakup with James.
Kara starts Thanksgiving with an annual Danvers family tradition: going around the table and sharing what they’re thankful for. All season, Lena has typically been playing her own side, but every time she ends up doing what’s right. Kara thinks Lena (Katie McGrath) will help them track Lilian Luthor (Brenda Strong), but when she confronts Lena about her mother’s activities, Lena is unwilling to believe it of her mother. Surprisingly, after Lena’s conversation with Supergirl, Lena was seen with her mother as she launched a rocket that will disperse the virus. Of course, it’s not J’onn; it’s Hank Henshaw aka Cyborg Superman. Kara was left wondering if she had been reading too much from Mon-El’s actions that she was starting to hallucinate. Turns out J’onn is acting weird because it’s not J’onn but Cyborg Hank who basically kicks Mon-El’s alien ass. So, curious to see where Mon-El’s story goes next. Her brother is one of the world’s most famous supervillains, and-as she learns in this episode-he didn’t fall far from his mother’s tree. Because really, it would have been pretty lame if Karas accusation about Lillian was enough to set Lena down a dark path. Mon-El is put under quarantine at the DEO until everyone can figure out if the gas will have any effect on him and whether he’s contagious. While I was very excited about Barry and Cisco’s arrival in the last five minutes of “Medusa“, the most compelling parts of this episode gave closure to two parallel storylines about the fluidity of identity, and the anxiety that results when one’s identity is discovered to be mutable. Kara flies to the fortress, where a hologram of her father reveals he created the virus to kill all non-Kryptonian life forms in case of an invasion. To a scientist on Krypton, we would be the aliens, and all the human help in the bar should have died with the other aliens. Afterwards, Eliza tells Alex that she knows that Alex is gay (Alex talks about Maggie a lot) and says that she loves her no matter what. Well then, perhaps Ill just go ahead and have a chat with Kara and her crew if its sympathy Im looking for. Just then Mom and Alex run up – they know how J’onn will weaponize it with something at L-Corp. Eliza tells Kara that Mon-El is fighting hard against the virus, but that the infection will win if a cure isn’t found. Kara gives her mother and Alex the information she found in the Fortress of Solitude so that they can try to make a cure.
The big ol’ DC crossover doesn’t really start until the final minute, but Supergirl and Martian Manhunter slug it out with Cyborg Superman. This irritated me. I fully acknowledge that maintaining Season One’s status quo – where Kara and her cousin Clark communicated exclusively by text message, and the potential global threats that Supergirl faced down were not, evidently, significant enough to draw the attention of Earth’s other Kryptonian – could not be maintained. Lena suddenly throwing her lot in with her mother because she was mad at Supergirl’s accusations?
The episode concludes with Kara returning to her apartment to find that a familiar face has just jumped through another rip in space/time like the one that appeared at Thanksgiving. Lena and her mother have a strained relationship, mostly because Lena is adopted. While her response isn’t entirely surprising, Eliza’s accepting and loving response to Alex’s admission was incredibly heartwarming.
Mon-El’s nearly death (as well as some teasing from Eliza) prompts Kara to think about Mon-El in a romantic light. When Mon-El was dying, he told Kara how lovely she is and kissed her. In the end, Lena continues to prove she is a good Luthor and that is a really unique character for the show to keep around.
Winn figures out that Cadmus has the virus and is taking it to the port to release Medusa. Oh, that’s right, she’s a reporter. But first… Supergirl and her National City team have to stop Cadmus.
J’onn, sadly, doesn’t fare much better. Hank confesses he was poisoned and is turning into a white martian. Supergirl asks Mon-El about what happened between them, but he claims he doesn’t remember (or, actually, he does but isn’t saying), so Supergirl doesn’t bring up the fact that they kissed.
While at the hospital later Alex passed along the news to Maggie, and the two had a nice moment as the former realized that while she liked Maggie, she didn’t need her in order to be happy.