Black Lightning faces off against Gravedigger.

After learning that Gravedigger and the Markovians are coming to attack Freeland, the Pierce family prepares for war.

Three years after Batman mysteriously disappeared, Gotham is a city in despair, and it's under the watch of Jacob Kane and his military-grade Crows Private Security, which now protects the city with omnipresent firepower and militia. When the Alice in Wonderland gang targets the firm, Kane's daughter Kate returns home, deciding that if she wants to help her family and her city, she'll have to become the one thing her father loathes -- a dark knight vigilante. With the help of her stepsister Mary and the crafty Luke Fox, the son of Wayne Enterprises' tech guru Lucius Fox, Kate Kane continues the legacy of her missing cousin, Bruce Wayne. Armed with a passion for social justice and a flair for speaking her mind, Kate soars through the shadowed streets of Gotham as Batwoman.

At 11, Barry Allen's life changed completely when his mother died in a freak accident and his innocent father was convicted of her murder. Now a crime-scene investigator, his dedication to learn the truth about his mother's death drives him to follow up on every new scientific advancement and urban legend. When his latest obsession -- a particle accelerator heralded as a world-changing invention -- causes an explosion, it creates a freak storm and Barry is struck by lightning. He awakes from a coma nine months later with the power of superspeed. When he learns that others who have gained powers use them for evil, he dedicates himself to protecting the innocent, while still trying to solve the older mystery.

When presumed-dead billionaire playboy Oliver Queen returns home to Starling City after five years stranded on a remote island in the Pacific, he hides the ways the experience has changed him. As he reconnects with those closest to him, including his sister, Thea, Oliver appears to be the same wealthy, carefree bachelor they've always known. At night, flanked by his devoted friend, Diggle, Oliver uses his secret persona -- that of a vigilante -- to right societal wrongs and transform the city to its former glory.

At 12 years old, Kara Zor-El escapes doom on planet Krypton to find protection on Earth with the Danver family, where she grows up in the shadow of her foster sister, Alex, and learns to hide the extraordinary powers she shares with her cousin, Superman. Now an adult living in National City and working for media mogul Cat Grant, Kara finds her days of keeping her abilities a secret are over when super-secret agency head Hank Henshaw enlists her to help protect the city's citizens from threats. Finally coming into her own, Kara must juggle her new responsibilities with her very human relationships.

"Arrow" and "The Flash" have some new superhero company in the CW's lineup with the addition of "DC's Legends of Tomorrow." After seeing what doom the future holds, time-traveling rogue Rip Hunter realizes heroes alone are not enough to prevent the impending catastrophe that threatens not only the planet, but all of time itself. Tasked with recruiting both heroes and villains, Rip brings together a ragtag team of divergent talents, which includes the likes of Sara Lance, Ray Palmer, and Heat Wave.

Spencer James is a rising high school football player and A student at South Crenshaw High, but when coach Billy Baker recruits him to join his team in Beverly Hills, Spencer's mother, Grace, and his best friend, Coop, convince him it's an opportunity he has to seize. Forced to move in with Billy and his family to protect his transfer permit to Beverly, Billy's son Jordan, who is also the starting quarterback, is less than thrilled to be sharing his father's attention -- or the team spotlight. While Spencer struggles to find his footing, he makes an unlikely friend in Jordan's sister, who is struggling with her own demons.

Archie Andrews starts the school year with the world weighing on his shoulders. He's decided he wants to pursue a future in the music business, but his recently ended clandestine relationship with the music teacher has left him without a mentor, and his friendship with Jughead Jones is in a bad place. Things look like they might be turning around when Veronica Lodge, a new girl, arrives. Despite the instant chemistry, Veronica is hesitant to risk a friendship with Betty -- who has a crush on Archie -- to pursue anything. Amidst all the small-town banality lurks a mystery: the recent tragic death of Jason Blossom, the twin brother of beautiful and popular troublemaker, Cheryl.

Based on the celebrated graphic novel by Alan Moore and Dave Gibbons, the exciting and dark "Watchmen" takes place in Tulsa, Okla., 34 years after the original story. After a white supremacist attack on the local police department, which leaves only two surviving cops on the beat, laws are passed that allow them to hide their identities behind masks. One of these cops, Angela Abar, adopts the identity of Sister Night and fights racists while dealing with the decades-long legacy of the vigilantes.