The group uses Ray's invention to track new recruits to help save the universe. The Monitor sends Iris, Clark and Lois in search of a mysterious Kryptonian, while Kate and Kara head out to find Bruce Wayne. In addition, Mia challenges Sara, Rory discovers a hidden talent, and Lex Luthor returns. This crossover begins on Supergirl S5E09, and continues on The Flash S6E09, Arrow S8E08, and Legends of Tomorrow S05E01.

More of Alice’s dark past is uncovered when Cartwright shares a twisted story with Kate while Jacob goes searching for his wayward daughter. Mary and Luke follow a lead on Beth's killer.

When a familiar foe descends upon Gotham, Batwoman and Mary find they must rely on each other more than ever. Alice has a has a new mission - and gets an unexpected ally to join her.

Kate begins to question her instincts and Luke gets upsetting news. Alice seeks her sister’s help with a special task.

Ryan asks Sophie to accompany her to a dinner at Jada’s to do recon on what her estranged mother knows about Wayne Enterprises, but the evening takes a turn when an uninvited guest drops in on the intimate gathering. As the terrifying evening unfolds, Ryan witnesses another side to Marquis and her mother.

Ryan, Sophie and Jada come together to formulate a plan to stop Marquis, while Mary seeks to make amends for the harm she did as Poison Ivy. Meanwhile, Alice continues to spiral out of control and contend with her mental demons.

When Sophie must face a foe from her rookie days with The Crows, Ryan, Mary and Luke are also pulled into the villain's game. Meanwhile, the tables turn on Alice when she finds herself in dire circumstances, and Jacob continues to revisit the past.

As Luke Fox's life hangs in the balance, repercussions from the devastating event are the catalyst for some life-changing decisions for those around him.

Batwoman struggles as Black Mask continues to raise the stakes with Circe as his henchwoman. Alice and Safiyah cross paths once again.

Ryan questions her place as the city's hero as she, Luke, Mary and Sophie must join forces when Black Mask instigates chaos in the Gotham streets. Meanwhile, Alice's attempt to rescue her sister means another encounter with Circe. In an epic standoff, unexpected alliances and transformations will upend Gotham as we know it.

As Ryan’s family dynamic grows more complicated, she also finds herself in the middle of a Bat Team stand-off between Luke and Mary. Meanwhile, Alice finds a new sidekick to do her bidding.

Batwoman’s hands are full as she juggles Jada’s demands, Mary’s ever-increasing power and a new romantic entanglement. Loyalties are tested and motives come into question as Batwoman races against the clock to once again save the city and those closest to her.

Just when it seems things can’t get worse... Batwoman’s identity is once again at risk of being exposed, and some of Gotham’s most villainous unite. Sophie joins Luke on a mission and Alice gets into Mary’s head.

Joining forces with Jada, Batwoman and a panicked Bat Team must race against the clock as Marquis's nefarious plan balloons into something Gotham would never have suspected...and won't see coming. And as Alice reaches her breaking point, an empathetic Mary makes another appeal on behalf of her sister for the Joker's buzzer, but everyone wonders - is Alice beyond saving?

Batwoman enlists Luke and Julia for an undercover mission to recover one of the most important items from her cousin’s arsenal. While Alice continues developing her devious plans within Arkham’s walls, she gets an unexpected visit from Jacob Kane who needs her help. Meanwhile, Mary tries to prove herself to Kate. As Sophie gets closer to a co-worker, Kate reunites with an old flame.

An unnerving discovery in a garden shed sends Renee Montoya rushing to Ryan to ensure the city is on high alert. Her terrifying theory — a Bat Trophy has entangled a new host, and her thorny ways are weaving their way through Gotham. Alice is suspiciously eager to help the Bat Team, and Sophie seeks vengeance for an incident involving her sister.

On the Kane sisters’ birthday, Kate and Alice contend with demons from the past, and an unexpected guest makes a surprise appearance in Gotham.

With the hunt for Alice heating up, Kate faces a difficult decision.

Batwoman's abilities are tested like never before, while Alice's search for Kate continues. Sophie and Jacob set their sights on Coryana, and Luke and Mary contend with an unexpected guest.

While Mary and Alice continue their sisterly bonding, Ryan, Luke and Sophie are desperate and willing to do almost anything to stop them. Renee is forced to revisit her heartbreaking past. Meanwhile, Marquis grows more unhinged and throws a spectacularly sinister soiree at Wayne Tower... and everyone is invited.

Ryan, Sophie and Luke attempt to track down the OG Poison Ivy when all signs point to Pamela Isley’s reappearance in Gotham. At the same time, Mary feels drawn by a powerful force and Alice suddenly feels very protective of her stepsister. Meanwhile, Jada hasn't given up on rehabilitating Marquis and seeks the help of an old friend.

Kate and Alice continue their sister/nemesis dance, while Alice and Mouse construct their most evil plan yet. Mary invites Kate to a special event honoring Catherine and Jacob makes a decision that leaves Kate perplexed.

Batwoman encounters a new challenge when an old villain resurfaces, testing the heroics of Gotham’s most stand-up citizens. Alice’s limits are tested.

When members of Gotham's intelligentsia begin disappearing, Commander Kane, Sophie and the Crows go searching for the newest homicidal threat to the city. In the meantime, Kate is consumed with someone’s betrayal and starts questioning the loyalty of everyone around her just when she needs them most. So when Luke and Julia go missing, Batwoman must rely on Mary and a former foe to deploy her rescue mission. Meanwhile, Alice enlists Tommy Elliot to help acquire an elusive item that her sister also seeks.

When one of Gotham's former heroes returns to his old stomping grounds to settle a score, both Batwoman and Commander Kane find themselves on the defensive. Meanwhile, Alice has uncovered what could finally take down Batwoman, but she is losing hold on her henchman Mouse and Hush, sending her spiraling into her most wicked self. Luke immediately focuses on finding a way to protect Batwoman from Alice, and Mary has a chance to be the sister Kate has needed all along. New information surfaces, forcing Julia to warn Sophie about the person pulling the strings. And in a final standoff, when Commander Kane refuses to retreat from his war on Batwoman, Kate may find herself more than heartbroken by her father’s choices.