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"There is a point where you can go too far, and we'll see if that happens," executive producer Jason Rothenberg tells E! News. "We'll see if Clarke is able to find that point and pull herself back from it or if she's in fact driven to the end of the line."

Lexa is committed to doing whatever she needs to do in order to save her people from the terror of the Mountain Men, and Clarke will need to decide if she's ready to do that as well.

"Lexa has such a thirst for success," Debnam-Carey tells E! News. "She's driven and powerful, and is hungry for justice so she really feels, going into this, she is all in. She's been ready for this for a while. But she is still very pragmatic and logical and good at adapting, so if things change, she's ready for anything."

She continues, "Lexa's main responsibility has always been keeping her people safe. Her ruthlessness, her rationality, her cold-heartedness all stems from protecting the people she loves. And that's Clarke's goal as well. Ultimately, all things are put aside for this battle. This is what we've been preparing for all season and it's finally here."