Warning: this review contains spoilers. You can find all of my Supergirl reviews here.
It’s crossover week in the Arrowverse! And though Supergirl is joining the Flash, Green Arrow, and the Legends of Tomorrow in the “Invasion” event, this week’s Supergirl episode was, for the most part, unrelated. On its own, “Medusa” was a focused and streamlined episode that delivered some unexpected but satisfying payoffs.
The plot of “Medusa” was almost exclusively devoted to Cadmus. That alone was a major step up from last week in that it wasn’t juggling more subplots than it could handle. The absence of Guardian’s screentime-devouring story helped “Medusa” feel tight and purposeful.
Cadmus’s latest evil plan was to unleash a deadly aliens-only virus on National City. What’s interesting about this was Kara’s knowledge of Lillian Luthor’s identity, which allowed her to rope Lena Luthor into the events. “Medusa” cleverly played with the audience’s expectations of Lena’s allegiance, feigning a dark turn only to have her play a crucial role in Lillian’s arrest. I’m glad Supergirl is standing by the decision to have Lena be one of the good guys.
Lillian’s defeat and arrest is a big development. Will she bounce back quickly, or is Cadmus going to be temporarily put on hold for now? We caught a brief glimpse of seemingly nefarious aliens on the hunt for Mon-El this week—could they be the next major villains for the short run?
Speaking of Mon-El, he has the potential to be a very good character, but as a romantic interest he’s just bland. So I’m glad that it looks like he’s going to become relevant in a major way soon. Because right now he’s nothing more than a love interest that literally fell out of the sky.
I am, however, a bit let down by how quickly J’onn’s mutation into a White Martian was resolved. Though he got a cool moment of would-be self-sacrifice, I don’t like how quickly he was healed from what should have been a more meaty plot development.
“Medusa” also had some heartwarming moments courtesy of Alex, who both came out to her mother, and whose feelings for Maggie were finally reciprocated. The scene where she tried to come out over Thanksgiving dinner only to have her declaration be hijacked by James and Winn was humourous, in a frustrating sort of way.
The cliffhanger of the episode, of course, was the lead-in to the “Invasion!” crossover. Even though I know all the CW shows exist on the same channel and in the same multiverse, it was still incredibly cool to see Barry and Cisco land on Kara’s Earth. And super exciting when the end title card read “To be continued on The Flash“!