Credit: Bettina Strauss/The CW

Warning: This story contains major spoilers from the winter finale of Supergirl. Read at your own risk!

Supergirl‘s winter finale kicked off the upcoming four-way crossover with The Flash, Arrow, and DC’s Legends of Tomorrow, bringing Barry Allen and Cisco Ramon to Kara’s universe to enlist her help in fighting the Dominators. But that was the least of several big surprises in the final Supergirl episode of 2016.

In the winter finale, Cadmus unleashed Project Medusa, a Kryptonian-made virus created by Kara’s (Melissa Benoist) father with the sole purpose of killing other aliens. Ultimately, Lena Luthor (Katie McGrath) was able to prevent a widespread dispersion by pretending to side with her adoptive evil mother Lillian (Brenda Strong), but instead neutralizing the virus and turning dear mother in to the police.

“We have absolutely not seen the last of Lillian and Cadmus,” executive producer Andrew Kreisberg tells EW. “Sometimes an enemy is deadliest when they are trapped. How Lillian deals with her incarceration and what happens moving forward will make up part of the storyline of the next batch of episodes. But Cadmus is a multi-tiered organization, and like the worst terrorist groups, you cut down one head, another rises in its place.”

The question remains whether Lena truly is on Supergirl’s side; after all, she is a Luthor. “I don’t want to say definitively, because this season is all about testing Lena,” Kreisberg says. “She’s passed the goodness tests that have been placed in front of her up until now, but you always have to wonder if there is going to be a bridge too far for her where she will inherit the Luthor mantle of being a true enemy for Supergirl.”

Believing he would die after being infected by Medusa, Mon-El (Chris Wood) kissed Kara, though played dumb once he was healed — something that will continue when the show returns. “The chemistry between Chris and Melissa is definitely palpable, and we’re loving writing their characters together,” Kreisberg says. “The next episode is a big Kara/Mon-El story that we’re really excited about. They’re both obviously playing coy about what happened, neither admitting that they actually did kiss, so how and when that comes out is going to be fun and delicious.” Also on tap to shake up their blossoming relationship: There are aliens apparently hunting down Mon-El.

Elsewhere, Alex (Chyler Leigh) successfully came out to her mother Eliza (Helen Slater), helping Alex to realize that this is her “new normal” and coming out wasn’t necessarily tied to Maggie (Floriana Lima). Maggie, in turn, realized her own feelings for Alex after her near-death experience, leading to a steamy kiss. “The chemistry between Chyler and Floriana, if you could bottle and sell that, you could rule the world,” Kreisberg says. “They so deserve to be together, but like any great couple, they had to get past their own stuff to finally get there.”

“This is our holiday episode, it’s our midseason finale, and nothing ends this section of the show better and sends us into our next batch of episodes than having a kiss,” Kreisberg continues. “It was really important for us to progress this relationship along and to have it pay off everything that came before it. Everyone who works on this show loves Alex Danvers and wants good things for her and Maggie, so we decided to go for it.”

Stay tuned for much more scoop on Supergirl — including teases on Mon-El’s big secret, what’s next for J’onn and where Alex and Maggie’s relationship will fare during the winter hiatus!

Supergirl will return in 2017.

Episode Recaps


Kara (Melissa Benoist) steps out from her super-cousin’s shadow to become Supergirl and defend National City in the third Arrowverse show.

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