[SPOILERS for those not caught up on Supergirl ahead.]

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Things are heating up in Supergirl, as The CW superhero show brings its season 2 finale to a close. Things are getting hairy for our favorite bubbly Kryptonian, who has been saddled with the worst in-laws of all time. Rhea, a vengeful Daxamite, is hell-bent on destroying the Earth and capturing her son/Kara's boyfriend, Mon-El. Last week, Kara fought to stop an arranged marriage between Mon-El and her best friend Lena Luthor, all while pushing back against an oncoming deluge of invading Daxamite ships.

Though Kara was finally able to get to Rhea, thanks to help from the DEO and her former mentor Cat Grant, Mom-El had one final trick up her sleeve, and revealed an evil, mind-controlled Superman. Now, as the season 2 finale draws near, Kara must do battle with her beloved -- and physically formidable -- cousin, Clark. And it will be no easy task, if these recent promotional images we received are any indication.

The CW released a series of new images from Supergirl's season 2 finale, "Nevertheless, She Persisted". These new glimpses into the high-stakes episode feature Superman as both enemy and ally, as well as what looks like a return to the Fortress of Solitude. Check out these new stills from the upcoming episode, below:

[vn_gallery name="Supergirl Season 2 Finale Images" id="968795"]

There are a lot of theories as to why Superman went to the dark side - perhaps the most intriguing of which is that he is actually M'gann in disguise - but it looks like whatever hold Rhea has over Clark is, thankfully, temporary. If the upcoming episode's promo is any indication, Supergirl will face off against Superman, but the episode's ultimate battle will be against Rhea herself. That arc makes it seem as though Kara and friends will find a cure for Clark fairly early on in the episode, before tackling the greater problem at hand.

No matter how events really line up in the episode, though, Team Kara has their work cut out for them. The Daxamite invasion means a political firestorm for the DEO, who have already been fighting against anti-alien bigotry (as most evilly exemplified by Lillian Luthor's Cadmus). With last episode's reveal that President Marsdin is a Durlan refugee herself, this arc likely means greater repercussions for the Supergirl universe as a whole.

All in all, this is shaping up to be a thrilling conclusion to the Arrowverse TV show's somewhat rocky sophomore season. The show has had some trouble adjusting after its CBS-to-CW move, but it's found its footing again, post-Spring hiatus. James-centric episode "City of Lost Children" was particularly exceptional, and brought the show back to its heartfelt roots just in time for an exciting penultimate episode. Given that awesome lead-up, we're excited to see the show end its second season with a bang (and a punch).

NEXT: Supergirl Season 2 Finale to Introduce Season 3 Villain

Supergirl wraps up next week on The CW with the season 2 finale "Nevertheless, She Persisted" airing Monday, May 22 at 8 p.m. EST.

Source: The CW