Ryan and Alex from "Quantico"
Ryan and Alex from "Quantico"Facebook/Quantico

Season 1 of "Quantico" is coming to a close soon and the showrunners have already started teasing that the actual terrorist within the FBI will be revealed soon. In fact, fans may not even have to wait till the finale to learn the truth, because the promos for the upcoming Season 1 episode 20 of "Quantico" suggest that Alex (Priyanka Chopra) will uncover the mystery on coming Sunday.

Since the premiere of the ABC show in September 2015, fans have had various theories about the bomber, accusing everyone from Alex to Miranda (Aunjanue Ellis). "Quantico," however has always managed to debunk all theories with each passing episode and now as the season comes to a close, fans are still as confused as they were in the beginning.

Check out the promotional photos from the finale episode titled "Yes" shared by SpoilerTV and see if you can come up with new theories for the bomber of "Quantico."

Meanwhile, the synopsis for the upcoming "Drive" suggests that Ryan be portrayed as the prospective bomber yet again. "Alex doesn't know who to trust when she discovers new information about the man she loves," read the synopsis. Meanwhile, the promo shows Ryan trying to arrest Alex in the current timeline, as she warns him that trying to stop her might put the lives of thousands of people in danger.

The previously aired "Fast" proved for a fact that there is a new bomb in play, this one built by Will (Jay Armstrong Johnson). However, before Alex or Shelby (Johanna Brady) could get any information out of him, he died due to direct contact with a nuclear bomb. Meanwhile, Simon's (Tate Ellington) fate remains unknown.

The synopsis for "Drive" also suggests that Caleb (Graham Rogers) and Shelby's relationship will change, hopefully for the better. After all, Shelby had admitted that she is still in love with the senator's son. Watch Season 1 episode 20 of "Quantico" at 10 p.m. (EST) Sunday, May 1. You can also live stream "Drive" via ABC Go!

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