Warning: This article contains spoilers about Sunday’sBatwomanepisode, “A Secret Kept From All the Rest.”
Batwoman’s latest episode revealed that the key to killing Batwoman is something familiar but also foreign.
to save her friends' lives, Kate (Ruby Rose) gave Lucius' journal-translating glasses to Alice.

Dean Buscher/The CW
ENTERTAINMENT WEEKLY: How did you land on Kryptonite being the key to killing Batwoman?
One of the most wonderful aspects of the crossover was the Kate Kane-Kara Danvers friendship.
So, I wanted to keep that in our world.

Even though its an alien rock, we have introduced it on our show.
Is there something unique?
So I was like, Yes, Kryptonite!
There are very few [rocks] in our ether.
So it’s a way for you to incorporate weirder elements from the shared universe while usingBatwoman’s language?
What happened was that this relationship came out of it and thats what we can glob onto.
Does this mean we might get aSupergirlcameo in the finale?
This episode also revealed that Julia was planning Safiyah mention is setting up season 2?
Yes, shes somebody were teeing up for season 2.
Shes definitely somebody Im looking forward to introducing and writing about.
Ill admit, I thought Julia was calling Alfred.
Yeah, people were guessing Alfred.
People were guessing Bruce.
Julia and Sophie finally kissed in this episode, too.
What made them a good pairing?
We wanted to continue to show the next chapter of Sophies journey as an out lesbian.
Now, Im ready to navigate my love story in the real world openly.
Where is this couple going in the finale?
Their story is a little truncated because we had to stop production early.
The logline for the finale teases the return of one of Gotham’s “former heroes.”
Is this someone weve met before, or someone new?
Its not Bruce Wayne, Im sorry to say [laughs].
This is sort of our sports episode.
Yeah, because at the end of this episode, Jacob threatened Batwoman with war.
[Laughs] Yes, war is not a gentle word to throw around.
Its going to be tense.
Episode 20 wasn’t supposed to be the finale, but it is now because of the shutdown.
How do you feel about this being how season 1 ends?
This finale has the coolest cliffhanger possible and it really tees up season 2 in an amazing way.
Yes, Im totally bummed obviously because who wouldnt be?
because we already had two scripts written.
But in terms of the creative, its really good and Im really proud of it.
For the circumstances, it couldnt have worked out better.
Batwomanairs Sundays at 8 p.m. on The CW.