Welcome to The Hollywood Reporter's special Comic-Con edition of DC TV Watch, a rundown of all things DC Comics on TV. Each week, we round up the major twists, epic fights, new mysteries and everything else that goes down on The CW's DC fare. This week, we're on the scene in San Diego breaking down all the highlights from the Black Lightning, Arrow, The Flash, Legends of Tomorrow and Supergirl panels. So keep refreshing this page as we update with news and highlights from each panel starting with Supergirl and continuing through with updates from Legends of Tomorrow at 4:10 p.m. PT, Black Lightning at 4:50 p.m., The Flash at 5:10 p.m. and Arrow at 5:50 p.m.

SUPERGIRL
(Season three returns Monday, Oct. 9 at 8 p.m. on The CW)

The big news: Four new actors have joined Supergirl for season three: Adrian Pasdar (Heroes, Agents of SHIELD), Carl Lumbly (Alias), Yael Grobglas (Jane the Virgin) and Emma Tremblay (Elysium).

What you need to know: Pasdar will play charismatic capitalist Morgan Edge, a ruthless real estate developer who will stop at nothing to get what he wants (and what he feels he deserves). The DC villain’s big plans for National City instantly put him at odds with Supergirl (Melissa Benoist) and Lena Luthor (Katie McGrath). Lumbly will reprise his Justice League animated character, the classic DC Comics Martian M’yrnn J’onzz, aka J’onn J’onnz's (David Harewood) father. A pacifist religious leader on Mars, M’yrn pushes his son in unexpected ways -- and not just in the past, because M'yrnn will find J'onn in the present as the other last remaining green martian. Grobglas will play villain Psi, a psychic who uses people’s own minds against them. Psi’s agenda puts her on Supergirl’s radar, and their meeting will affect the Girl of Steel in surprising ways. And Tremblay will play Ruby, a smart, independently minded National City kid who’s fascinated by Supergirl and ends up in jeopardy because of it.

Other teases: New showrunners Jessica Queller and Robert Rovner revealed that the theme of season three is what it means to be human. "All of the characters will be exploring that question, especially Kara," Queller said.

Calista Flockhart will also return for a recurring role in season three, which will see Cat Grant — who viewers now know always knew that Kara was Supergirl — reunite with her.

Another fan-favorite character, Mon-El (Chris Wood), also had his fate up in the air after escaping Earth's toxic lead-filled atmosphere in the finale. But Wood surprised the audience with his appearance at the panel and Rovner revealed that, "Mon-El will return at some point. But how he does is one of the central mysteries of season three."

And "Sanvers" fans were treated to some positive news from the showrunners, despite Floriana Lima's demotion from series regular to recurring guest star for season three. Alex proposed to Maggie in the season two finale, and Queller promised their story is not over despite the casting change. "Most of you know that Floriana is not able to return for the full season but that being said we have an amazing beautiful story to tell that really honors the love between these two women."

Check out the new trailer, below.

LEGENDS OF TOMORROW
(Season three premieres Tuesday, Oct. 10 at 9 p.m. on The CW)

The big news: Neil McDonough is back as a series regular, meaning Damian Darhk will be one of the season's main villains. Meanwhile, Wentworth Miller (Captain Cold/Leonard Snart) and Arthur Darvill (former captain Rip Hunter) will return as recurring guest stars.

What you need to know: This won't be the Damien Darhk fans are used to seeing. "We'll be meeting a new version of Damien Darhk, a little less silly and a little more dark," executive producer Phil Klemmer said. And this will also be a "different iteration of Snart," according to executive producer Marc Guggenheim.

Other teases: Last season ended with the Legends "breaking time," and season three will pick up directly at that WTF moment when they arrived in Los Angeles. "We're not going to fix time immediately but we will deal with the issue of dinosaurs in Los Angeles," Guggenheim teased.

As for new Legends team member, Tala Ashe revealed that her character Zari will meet the Legends in the year 2030. "She's seen the fallout from 2017 and lives in the dystopian future," she said.

And will Constantine (Matt Ryan) ever return to the Arrow-verse? "We talked to Matt," Guggenheim answered cagily. "Matt's currently busy doing something right now but we've had really good conversations with Matt."

Check out the new trailer, below.

BLACK LIGHTNING
(Series premieres midseason on The CW)

The big news: James Remar (Dexter) and Damon Gupton (Bates Motel) join the newest CW DC show as series regulars.

What you need to know: Black Lightning, which joins The CW's DC Comics lineup come midseason, continues to bulk up its cast with Remar as Peter Gambi, the oldest friend of Jefferson Pierce (series star Cress Williams). Gambi is Jefferson’s father figure, mentor and “tailor.” His history with Jefferson goes back farther and deeper than anyone knows, and Gambi’s role in Jefferson’s life will become a painful window into the past that will affect the future of their relationship forever. Gupton will play Inspector Henderson, a veteran officer of the law who is now the highest-ranking detective on the force. His role in the community puts him at odds with Black Lightning but they soon become unlikely allies.

Other teases: Executive producers Salim Akil and Mara Brock Akil revealed that the series will tackle real world issues through the lens of the superhero genre. "The most interesting thing about this family is not that they're African-American," Akil said. "The challenge is not giving into the idea that we need to be perfect. Yes, there definitely is a problem with police brutality and we will get into that but there is also a huge problem of us killing each other and we don't mind addressing that."

"We get to shade in the humanity of those who need that help in our communities," Brock Akil added. "We also get to shade in why our bad guys are bad. That's an opportunity that we can add from our perspective of what's happening in our real world today and hopefully help."

THE FLASH
(Season four premieres Tuesday, Oct. 10 at 8 p.m. on The CW)

The big news: Meet the face of season four's villain, Clifford DeVoe aka The Thinker: Neil Sandilands (The 100, The Americans).

What you need to know: After name-dropping iconic DC supervillain DeVoe several times last season, The Flash has cast Sandilands in the major role. The CW's version of the comic book character is a metahuman with a mega mind who embarks on a season-long battle with The Flash that pits the “fastest man alive” against the “fastest mind alive.” A true genius, he’s devised an intricate plan to fix all that he deems wrong with humanity. It's a bit of a departure from the comics, where DeVoe got his powers from technology instead of metahuman physiology, but it makes more sense for the show to make his origin story the particle accelerator explosion. As for The Thinker's right hand woman, Kim Engelbrecht (Dominion) has been cast as The Mechanic, a highly intelligent engineer who designs devices for DeVoe. She’s the truest of true believers who’ll stop at nothing to help him implement his plan to fix humanity.

But that wasn't all that was announced during the lively panel. Danny Trejo (Machete, Sons of Anarchy) has been cast as Breacher, a feared bounty hunter from Earth-19 and the imposing father to inter-dimensional bounty hunter, Gypsy (Jessica Camacho). His mission is to prevent any inter-dimensional traveler from threatening life on his planet — especially his daughter’s. Trejo's casting announcement got the biggest reaction from the audience, who went nuts after hearing his name.

Other teases: Fans gathered in Ballroom 20 got a sneak peek at footage from season four, including a new heroic voiceover from a strong and confident Iris (Candice Patton) who is leading the team in Barry's (Grant Gustin) absence, Barry's eventual return to Central City after an extended period of time as well as Caitlin Snow/Killer Frost (Danielle Panabaker) coming back to Team Flash as a combination of her two characters.

"With three speedsters in a row, we wanted to change it up," executive producer Todd Helbing said of making the season four villain a non-speedster. "It's the fastest man alive against the fastest mind alive. And we're really trying to lighten a tone a little bit. Last year got really dark and we want to get back to the jokes."

Check out the new trailer, below:

ARROW
(Season six premieres Thursday, Oct. 12 at 9 p.m. on The CW)

The big news: Arrow is upping its geek cred this season with the addition of Michael Emerson (Lost), who will recur as an unnamed mystery villainous character. Guggenheim revealed that he will play one part of a "villainous cabal" that will also include DC Comics character Richard Dragon, although he didn't announced that casting during the panel.

What you need to know: Guest star David Nykl will return as Anatoly Knyazev, because although Oliver's (Stephen Amell) island/Russian flashback story has ended, the show isn't done with his Russian connections entirely. But instead of being Oliver's ally, he's "coming back with a literal vengeance" and will make up another part of the villain group that will terrorize Oliver this season. "We want to really double down on family and groups and found families," Guggenheim said. "To that end, we started to think about a group of villains."

Other teases: The series will still employ a flashback storyline, but each episode will be "character specific" with flashbacks instead of one serialized story like the past five seasons. "Manu Bennett is back for the season premiere, but he's also coming back for a special two-part episode in the first half of the season where we're really going to be focusing hard on his character post-everything he's experienced on the show," Guggenheim revealed as an example. "And we intend to do a Slade Wilson flashback story."

While the cast and showrunners couldn't reveal who made it off the exploding island alive, Guggenheim teased that Oliver is a changed man moving forward. "We're going to see a new Oliver Queen," he said. "The last 10 years have really changed him."

And now that Oliver's son William (Jack Moore) is back in the picture, viewers will get to see a new side to the Green Arrow. "He's not the best dad," Amell said with a laugh. "My first day on season six, it was all with Jack who plays William. We had never really acted together and I was really legitimately nervous. He exceeded my expectations and I'm loving my scenes with him."

Check out the new trailer, below: