Playing Edward Snowden, Joseph Gordon-Levitt is paranoid. And with good reason.

“They’re going to come for me,” he said in the second trailer for “Snowden,” which offers a much closer look at what happened to the whistleblower as he attempted to share government secrets.

“And now that we’ve made contact they’re going to come for all of you, too.”

The new teaser shows Snowden as he first acquaints himself with journalists on whom he called upon to share mounds of data obtained through his job at the National Security Agency (NSA).

Also Read: Oliver Stone Says 'Pokemon Go' Is 'Surveillance Capitalism'

The latest clip for the Oliver Stone film also offers a first look at the romance between Snowden and his girlfriend, played by Shailene Woodley, and depicts the moment when he realizes his house is being bugged.

Also starring Tom Wilkinson, Rhys Ifans, Nicolas Cage, Melissa Leo, Zachary Quinto, Scott Eastwood, Joely Richardson, Timothy Olyphant and Ben Schnetzer, the film opens Sept. 16.

Stone made his first-ever appearance at San Diego Comic-Con on Thursday to discuss the biopic just hours before the trailer posted.

Also Read: 'Snowden' Director Oliver Stone Still Baffled by Edward Snowden: 'There Are Things We Don't Know'

He indicated that the real-life Snowden remains something of an enigma — in spite of his many hours of research and meetings with the man.

“Right now, ‘Snowden’ is a larger than life story of what’s happening right now under our noses and it affects the majority of you, in our audience,” Stone said as he opened his first appearance on stage at Hall H at San Diego’s convention center, at a panel that also included Levitt, Quinto and Woodley.

Also Read: 'Snowden' First Trailer Makes Paranoia Reality (Video)

Stone described at length the effort he and his team spent trying to really get to know Edward — from visiting him in person in Moscow to discussing the Snowden case with The Guardian journalists who covered the resulting scandal when the NSA analyst became a whistleblower against the U.S. government’s secret surveillance programs.

But despite all their efforts to see the big picture, Stone said, they never quite got there.

“We went as far as we could,” Stone said. “There are things that we [still] don’t know.”

9 Comic Con Panels We Can't Wait to See: From 'Star Trek' to 'Snowden' (Photos)

Comic-Con 2016 is upon us, so TheWrap has compiled a list of the biggest and best panels that you shouldn't miss when you wing your way to San Diego.
"Snowden"
When: Thursday, 11:45 a.m.
Where: Hall H

The world has long awaited the arrival of Oliver Stone's biopic of the infamous NSA whistleblower, played by Joseph Gordon-Levitt. After several release date delays, the film will screen for the first time in Hall H before its Sept. 16 theatrical premiere.

See video: ‘Snowden’ First Trailer Makes Paranoia Reality
Open Road Films
"Luke Cage"
When: Thursday, 5:45 p.m.
Where: Ballroom 20

Every Marvel/Netflix series has generated tons of buzz and this one looks to be no different. Mike Colter will reprise the role he originated on "Jessica Jones" as the titular hero, who has impenetrable skin thanks to an experiment gone awry.

In addition to first-look footage from the show, we might also get new information about "The Defenders" miniseries, which will see Cage team with, Jones, Daredevil and Iron Fist.

Also Read: Netflix’s New Marvel Series ‘Luke Cage’ Sets Premiere Date
Netflix/Marvel
"The Walking Dead"
When: Friday, 1 p.m.
Where: Hall H

Everybody's favorite zombie apocalypse series has become a mainstay at Comic-Con. But this year, the cast and creators will have to face down a convention hall filled with fans who are no doubt still stinging from the Season 6 finale cliffhanger. Expect some fireworks to fly.

Also Read: ‘Walking Dead': 11 Theories on Who Negan Killed
AMC
"Game of Thrones"
When: Friday, 2:15 p.m.
Where: Hall H

Season 7 hasn't even begun filming yet, so don't expect any first looks at this panel. But who doesn't relish the chance to see the stars of this megahit dish on every nuance from Season 6? Maybe they'll even address a few of those lingering fan theories.

Also Read: ‘Game of Thrones’ Shortened Season 7 Set for Summer 2017
HBO
"American Gods"
When: Friday, 3:15 p.m.
Where: Room 6BCF

"American Gods" has been trying to become a TV series since at least 2011, when HBO picked up the beloved Neil Gaiman novel for adaptation. It's been a long road to get here, but with the combination of Starz, Bryan Fuller and star Ricky Whittle, we can only hope that the long-awaited story of Shadow Moon has been worth the wait.

Also Read: ‘American Gods,’ ‘Ash vs Evil Dead’ Headed to Comic-Con
Starz
Warner Bros. Studios
When: Saturday, 11:30 a.m.
Where: Hall H

Fans can expect in-depth looks at "Suicide Squad," "Kong: Skull Island," "Wonder Woman," "King Arthur: Legend of the Sword" and "Fantastic Beasts and Where to Find Them." Get excited.
Warner Bros
"Star Trek"
When: Saturday, 2 p.m.
Where: Hall H

Cast members from every "Star Trek" series, including William Shatner and Jeri Ryan, will come together to celebrate the franchise's 50th anniversary. Bryan Fuller, showrunner for the upcoming CBS All Access series, will moderate. There's a good chance he could also bring some first-look footage or cast members from the new show with him.

Also Read: Netflix to Beam New CBS ‘Star Trek’ Series Internationally
CBS
Marvel Studios
When: Saturday, 5:30 p.m.
Where: Hall H

Disney has been gradually pulling away from Comic-Con in favor of its own rival convention D23, but Marvel's annual Hall H presentation still remains consistently surprising.

"Doctor Strange" footage seems like a sure bet this year, but we can't help but notice rumored "Captain Marvel" actress Brie Larson will also be in town, promoting "Kong: Skull Island." Official confirmation that she is our Carol Danvers would certainly keep up the tradition of Marvel thrilling 6,500 fans who camp out overnight just to hear what the company has to reveal.

Also Read: ‘Guardians of the Galaxy 2’ Concept Art Gives Fans First Look at New Female Character Mantis (Photo)
Marvel
"Riverdale"
When: Saturday, 6:30 p.m.
Where: Room 6BCF

That collective groan you heard one early morning in May was fans reacting to The CW putting its highly anticipated new show "Riverdale" onto its less favorable midseason schedule -- and with it, the lack of any footage or promotional material.

Without any photos or trailers from the comic book adaptation, those in attendance will be the first people anywhere to get a glimpse of the new Archie, Betty and Veronica.

Also Read: Comic-Con 2016 Schedule: All the TV Shows Heading to San Diego (Updating)
The CW