Ep 4. Survivors

Supergirl season 2, episode 4 titled "Survivors" is an action-packed episode filled with new characters and a new threat. The episode starts off with the introduction of a new character, Mon-El — a survivor from Krypton's sister planet, Daxam. Mon-El has been in a coma since he arrived on Earth and when he wakes up, he's not happy to find himself in a world where his people (Daxamites) are viewed as bad guys and with a different culture. This sets up a contrast between his character and Kara's, who sees Krypton as having a grievance with Daxam.

Meanwhile, the J'onzz family struggles with a new challenge. M'gann M'orzz, a White Martian who was rescued by J'onn J'onzz and is working at the alien-themed bar is accused of being a killer. This leads to a showdown between M'gann, J'onn and Alex that reveals surprising truths on both sides.

As Mon-El adjusts to his new environment, his true intentions are revealed. It turns out that he is from the royal family of Daxam and is being hunted by an assassin sent by his own family. Kara decides to help him and this leads to a fight scene between Supergirl and a group of Daxamites sent to take Mon-El back. Fans will be thrilled to watch this fight sequence, which is well-choreographed and executed with great visual effects.

As the episode progresses, it becomes clear that Mon-El's arrival on Earth has led to new trouble. Another spaceship crashes in National City, carrying refugees from Daxam who are seeking refuge from a civil war engulfing their planet. The President orders the DEO to provide humanitarian assistance to these refugees. This decision causes controversy, mainly because of the animosity between humans and Daxamites. The refugees themselves are not presented as a homogeneous group but rather individuals searching for a new home. Fans will be interested in seeing how Kara and her friends navigate this new situation, and how it influences the ongoing theme of alien/human relations.

The episode ends with the reveal of a new twist that sets up what is to come in future episodes. Fans will be on the edge of their seats waiting to see what will happen next.

Overall, "Survivors" is a standout episode in the series. Fans will love the introduction of Mon-El, and the exploration of his character and culture. The episode deftly balances the arrival of new characters with the ongoing storylines, and delivers plenty of exciting action scenes. The themes of alien/human relations are explored in new ways, questioning the idea of refugees and war and showing the complexity of the relationships/histories between different alien species. The episode ends with a solid cliffhanger, setting up the rest of the season and leaving fans eager for more.