EXCLUSIVE: 'Blindspot' Creator on Fall Finale: Mole Reveal 'Changes the Dynamic' Forever

Philiana Ng
Entertainment Tonight

UPDATE: Blindspot boss Martin Gero spoke to ET about the aftermath of Wednesday's intense fall finale, which finally revealed the identity of the mole. Click here to see what he had to say.

The biggest questions you've been asking on Blindspot are about to be answered -- most of them, anyway.

NBC's crime drama wraps up its fall run on Wednesday with a jam-packed finale filled with revelations, twists and shocking moments that will leave many parsing out what just happened. The good news? It'll leave you wanting more.

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"It's our biggest episode yet, both [in terms of] scope and emotions -- the emotionality of it, the character development, the twists," creator Martin Gero tells ET. "A lot of people when they read this were like, 'Holy sh*t, is this the series finale?' It feels enormous. We had a great midseason finale last year and I think this has bested it."

The identity of the mole has been an ongoing mystery for Blindspot fans this season: Who is the double agent ingrained within the FBI? Luckily for viewers, that answer will be revealed in the midseason closer.

Is it Nas (Archie Panjabi), the newest head of the NSA's Zero Division? Is it Dr. Borden (Ukweli Roach), the unassuming FBI psychiatrist? Or is it someone else within the team?

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"It's really split," Gero says of fans' guesses thus far. "There are going to be people who are going to be like, 'Yes! I've been right all along,' and the people who I hope will be slightly relieved that their choices were incorrect."

"It changes the dynamic of the show moving forward," he continues. "It's a big piece for us and one that we spent an enormous time on to really sell as to the why."

ET exclusively premieres a sneak peek from the fall finale, in which Jane (Jaimie Alexander) tips Weller (Sullivan Stapleton) off that Sandstorm's plan for Phase 2 is happening sooner than they expected. Watch the clip below.

Blindspot airs Wednesdays at 8 p.m. ET/PT on NBC.

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