Warning: This story contains major spoilers from the winter finale ofSupergirl.

Read at your own risk!

But that was the least of several big surprises in the finalSupergirlepisode of 2016.

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Credit: Bettina Strauss/The CW

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.

The question remains whether Lena truly is on Supergirls side; after all, she is a Luthor.

I dont want to say definitively, because this season is all about testing Lena, Kreisberg says.

The next episode is a big Kara/Mon-El story that were really excited about.

Also on tap to shake up their blossoming relationship: There are aliens apparently hunting down Mon-El.

Supergirlwill return in 2017.