Welcome to The Hollywood Reporter's weekly DC TV Watch, a rundown of all things DC Comics on TV. Every Friday, we round up the major twists, epic fights, new mysteries and anything else that goes down on The CW's Arrow, The Flash, Legends of Tomorrow and Supergirl and Fox's Gotham and what it all means. Note: Gotham, Supergirl, The Flash, Arrow and Legends of Tomorrow are on hiatus until the new seasons return in the fall. This week, we offer a crash-course refresher on all the season finales as a primer for when all the new seasons are previewed at Comic-Con next week.

Gotham 

Batman is officially here ... maybe? | Bruce Wayne (David Mazouz) is ready to take on his iconic DC Comics mantle on the Fox drama, even though he's still a young teen. In his final scene in the season three ender, he stopped a mugging in an alley dressed in all black before taking to the roof in a cowl-neck sweater and looking down on the city of Gotham in a very Batman-esque way. He became a proto-Batman. After Bruce adopted the first rule of his moral code (no killing) earlier in the season, it was the logical next step. But did it come too soon in the Batman prequel series? Oh, and let's not forget that Ra's al Ghul (Alexander Siddig) mind-controlled Bruce to kill Alfred (Sean Pertwee), only to then guide the young boy into using a Lazarus Pit to revive him. Because that should totally end well and without any consequences moving forward, right?

Major villain twist | Another character taking on a classic DC Comics identity is Butch (Drew Powell). After taking a gunshot to the head, Gotham didn't kill him off as expected. Instead, a nurse reading his health records was overheard saying he changed his name as he lay in a coma in the hospital: Cyrus Gold. Comic book fans immediately recognized that name as the pre-death identity of zombie supervillain Solomon Grundy, a character who frequently dies and gets resurrected in Slaughter Swamp. Is this potentially the season four big bad? As for the other two future Batman villains Catwoman (Camren Bicondova) and Penguin (Robin Lord Taylor), they each took a step forward in the finale. Selina picked up a whip for the first time and proved to be a natural at it (no surprise there), while Penguin froze his former love the Riddler (Cory Michael Smith) in a block of ice to portray prominently in his new club, the Iceberg Lounge (a staple in the comics). Jim Gordon (Ben McKenzie) is going to have his hands full when Gotham returns ... and he'll have to do it without his love Lee (Morena Baccarin) who fled the city yet again.

No Harley Quinn ... yet | Despite rumors circulating that a proto-Harley Quinn would be introduced last season, she never actually showed up in the finale. Or did she? Babs (Erin Richards) ended up getting electrocuted, possibly to death, but could that be her origin story to become Harley Quinn instead of her swan song? Stay tuned to find out, potentially this season.

Supergirl

Meet the new big bad | Supergirl's stinger scene in the finale was explained a lot sooner than viewers expected when the series announced Odette Annable's casting just a week after the episode aired. The House alum will play Reign, an "exciting interpretation of the infamous World Killer storyline from the pages of the DC Comics." Little is known about Reign and the Worldkillers in the DC Comics lore, so without much to go off of in source material, there is no telling where Supergirl will be taking this villain arc. Executive producer Andrew Kreisberg called their version of Reign "scary, powerful and heartbreaking," and it's already been revealed that Reign's costume will be different than her comic book counterpart. According to the comic books, the bloodthirsty Worldkillers were uncontrollable biological weapons created on Krypton, but once the Kryptonian Science Council outlawed them, all but five were destroyed. Zor-El (Robert Gant), aka Kara's (Melissa Benoist) father, felt guilt over his part in their creation so he didn't destroy the ones he made. After Krypton's destruction, the Worldkillers who survived only remembered their names, Kryptonian origin and purpose of conquering worlds. With the same physical powers, Reign will be a perfect match for Supergirl in a fight, and their personal connection/shared "parent" will give their battle a powerful, emotional note as well.

Good news/bad news for Sanvers | While Sanvers fans were delighted by Alex (Chyler Leigh) and Maggie's (Floriana Lima) romantic engagement in the finale, the surprise news that Lima would be demoted from series regular to recurring character in season three is not a good omen for their future moving forward. While it's not confirmed that her decreased capacity means trouble for Sanvers, it does mean their relationship will be shown less onscreen as Lima will be featured in fewer episodes, and that's a true shame as it is one of the few LGBTQ relationships represented responsibly on TV right now.

Kara's heartbreak | Faced with a tough decision, Kara had to sacrifice her happiness in the finale when she banished the attacking Daxamites by infecting Earth's atmosphere with lead. That meant her Daxamite boyfriend Mon-El (Chris Wood) had to flee as well, and his escape pod got sucked into a black hole in space. There's no telling where he'll end up or when we (and Kara) will see him again. This marks the second breakup for Kara in as many seasons. Will she continue to search for love or will she focus on staying single moving forward?

The Flash

Bait-and-switch death | All season long, The Flash threatened to kill off Iris (Candice Patton). In the finale, it did just that ... before revealing the murdered STAR Labs team member was actually H.R. (Tom Cavanagh) using a transmogrifier to fool Savitar aka future/time remnant Barry Allen (Grant Gustin). So Iris was saved, and it seemed as if she and the real Barry would finally get their happy wedding day after she shot and killed Savitar. But alas, there's no happy endings for Barry, as he needed to take the place of Jay Garrick (John Wesley Shipp) in the Speed Force prison to keep it from tearing reality apart in a massive electrical storm. With a smile (which was so weird) and a goodbye to Iris and his team, Barry filled that void and entered the Speed Force willingly. How will Central City fare without the Flash? Will Wally (Keiynan Lonsdale) be able to step up to the plate as Kid Flash? Barry will obviously return in season four, but how long will it take and how will his time in the Speed Force have changed him? 

Not another speedster | When he does eventually return, Barry will have to deal with a new kind of villain as season four will introduce the first big bad that is not a speedster. Name-dropped several times throughout season three, Clifford DeVoe aka the Thinker is a genius inventor who created technology to make his infamous “thinking cap,” which gave him extremely powerful mental powers. Introduced in 1943, DeVoe was a member of the Injustice Society, but he fought against Jay Garrick, not Barry Allen, so expect the show to put their own spin on the source material.

Arrow

Ending with a bang | Arrow ended season five with a literally explosive cliffhanger, as Adrian Chase aka Prometheus (Josh Segarra) killed himself to trigger the explosives he planted all over Lian Yu while presumably all of Team Arrow was still stuck on the island. Oliver (Stephen Amell) could only watch in disbelief as he feared he lost everyone he cared about in one fell swoop. Obviously the show won't kill off the whole team, but the fallout from that explosion could be game-changing. Did anyone suffer major, permanent injuries? Did everyone make it off the island? 

At least one death | In addition to the island explosion, Arrow said goodbye to a major original castmember in the finale when Malcolm Merlyn (John Barrowman) stepped on a land mine to save his daughter Thea's (Willa Holland) life. Though his death occurred offscreen, Barrowman took to social media to confirm his exit from the series. 

Surprise return | As the series concluded its island flashback storyline after five seasons, the surprise return of Moira (Susanna Thompson) ended the flashbacks on an extremely high and emotional note. Viewers got to witness the phone call Oliver made to his now-dead mother after his rescue from Lian Yu all those years ago. Seeing that mother/son dynamic again in such a pivotal and never-before-seen moment tugged at the heartstrings in a way that reminded fans of why they fell in love with this show in the first place. 

The return of Olicity | If Felicity (Emily Bett Rickards) does indeed survive that island explosion, she's got a newly rekindled relationship to look forward to. She and Oliver shared a kiss on the island before separating, and while some viewers may be tired of their relationship, they have finally gotten over their trust issues and can explore their new dynamic in a much more mature way. And based on how small but powerful their kiss moment was in the finale, hopefully Arrow won't overplay their relationship again. A little goes a long way.

Legends of Tomorrow

Major oops | After the Legends traveled back to a time they already meddled in, they came in contact with their past selves, a big no-no in the time travel guidebook laid out by Rip Hunter (Arthur Darvill). And for good reason: even though they saved the day and destroyed the Spear of Destiny, they essentially "broke time." The Waverider arrived to the "present" for a vacation in Aruba only to find dinosaurs roaming the streets with an entirely new timeline all out of wack. And with Rip no longer with the team as he officially passed the captain mantle over to Sara (Caity Lotz), these Legends will have to figure out how to fix time on their own. This should go well, huh?

New team member | At least they'll have another team member aboard the Waverider to help them figure out this mess. Tala Ashe (American Odyssey, Smash) has been cast as a series regular for season three. She will be playing Zari Adrianna Tomaz, a Muslim-American woman from the year 2030. According to the character description, "Zari lives in a world of contradictions. Technology has brought about incredible change in her future — too bad human nature hasn’t kept pace. Fear, prejudice and a lack of care for the planet have forced Zari to become a 'grey hat hacktivist.'" Described as a computer nerd with a wry, combative attitude, she lives a double life ... but doesn't realize that she has secret, latent powers derived from an ancient, mystical source. Although the character description veers from the source material, comic book fans will recognize her name as the superheroine Isis, a normal woman who uses an Egyptian amulet to summon the powers of the goddess Isis. Sounds like Zari will become fast friends with Vixen (Maisie Richardson-Sellers), the other team member with mystical powers derived from an ancient amulet. Either that, or they'll butt heads and become enemies pretty quickly, which would also be pretty compelling to see.

A more historical season | After news broke of Billy Zane's casting as P.T. Barnum, viewers now know some surprising new details about what Legends will be tackling in season three. “The thing about history books is that they turn famous people into 2-D characters," executive producer Phil Klemmer said. "This season on Legends, we want to meet other famous figures from history, people like Barnum, people we think we know, so that we can find the aspects of them, the parts of their story, that the history books left out — we want to bring history to life by infusing it with heart, humor and total absurdity (often at the same time).”

What do you think of all the shocking twists and reveals from the DC Comics finales? Let us know your thoughts in the comments section below.

Gotham returns for season four on Fox in the fall; Supergirl will return for season three on The CW in the fall; The Flash will return for season four on The CW in the fall; Arrow will return for season six on The CW in the fall; and Legends of Tomorrow will return for season three on The CW in the fall.