When the Gambler arrives in town to make amends, the team find themselves at odds whether he can be trusted.

After stumbling upon a suspicious murder in Blue Valley, the JSA begin looking at potential suspects. A tense run-in with The Shade makes Courtney and Pat realize that Sylvester's old ways could land them in hot water.

Courtney and the JSA receive an anonymous tip that could help in their murder investigation. Sylvester looks into potential jobs in Blue Valley.

After one of Sylvester's plans results in an unexpected outcome, Pat calls upon an old friend for help. Meanwhile, Beth uncovers a new suspect in their murder investigation, and Courtney reaches out to Cameron.

Courtney grows closer to Cameron, distracting her from her duties as JSA leader.

Courtney's teammates learn that she has been keeping secrets from them.

After Beth makes a major discovery on The Gambler's laptop, the team moves forward with a risky plan that effects the entire town of Blue Valley. Elsewhere, Jennie returns to the fold seeking help from Courtney.

Desperate to avert a major crisis on their hands, Courtney attempts to help a friend navigate their powers. Elsewhere, Pat and The Shade are forced to face their worst fears.

After Pat and Courtney return from Helix, Courtney apologizes to the JSA and they track the killer to the Mahkent house.

Courtney and the team regroup after a dramatic confrontation leaves battle lines clearly drawn. A terrifying discovery made by Mike and Jakeem forces Pat and Sylvester to go on high alert. Paula and Larry take matters into their own hands.

As Courtney, Sylvester and the JSA plot to take down a major threat, the arrival of someone from their past sends shock waves through the town.

Pat finally discovers who has been pulling the strings, while the JSA reunite.

The JSA squares off against Jordan, Sylvester, and the Mahkents, while the Young All-Stars fight Ultra-Humanite.

The Legends are trapped in 1925 when someone uses a future Waverider to blow up their Waverider.

The Legends contemplate how to get to New York City, Behrad discovers Hoover has train tickets to DC and Sara and Ava come up with a plan. With the help of Gary, Nate will have to impersonate Hoover.

Alice's biggest fan gets his hands on Mad Hatter's mind-control top hat, and goes on a crime spree.

Batwoman is forced to team up with Alice to hunt down the new Killer Croc. Meanwhile, Ryan meets her birth mother.

Astra and Spooner enter the-now-human Gideon's mind to save her from a virus, and meet some familiar faces.

This is the 100th episode.

The Legends become enmeshed with Mob business during a stopover in 1925 Chicago, and become moonshiners.

Ryan confronts her biological mother and get a surprising offer from her new brother. Meanwhile, the Bat Team searches for a canister containing Mr. Freeze's cold agent.

The Bat Team discovers that someone is using a variation of Mr. Freeze's freezing compound to experiment on freezing kidnapped people and reviving them and Sophie's sister Jordan is the next target.

Ryan asks Sophie to accompany her to a dinner at Jada's to do recon on what her estranged mother knows about Wayne Enterprises. As the terrifying evening unfolds, Ryan witnesses another side of Marquis and her mother.

While Sarah and her group prepare to use Davies' time machine, Spooner, Astra, Gideon rush to save them before it's too late.

An unnerving discovery in a garden shed sends Renee Montoya to ensure the city is on high alert. Alice is suspiciously eager to help the bat team and Sophie seeks vengeance involving her sister.

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. Alice finds a new sidekick to do her bidding.

The Legends are stranded in a forest, and pair off. Meanwhile, Behrad discovers where they are, while Bishop and the Gideon AI team up.

The Legends crash land in 1940s Seattle in the middle of World War II and find themselves working in an airplane factory alongside "Rosies". Behrad teaches Nate about Persian culture and etiquette.

When a powerful alien threat arrives on Earth under mysterious circumstances, Barry, Iris and the rest of the team are pushed to their limits in a desperate battle to save the world.

Despero warns The Flash that great tragedies will lead to Armageddon. Barry doubles down on proving his innocence, but a devastating revelation pushes him to seek counsel from Black Lightning.

Barry meets Black Lightning at the Hall of Justice after things take a dire turn with Despero. Iris suspects something is off with Despero's vision of the future so she seeks help from a powerful ally.

Barry is shocked when Eobard Thawne returns in the most unexpected way, and with a tie to a loved one. Damien Darhk offers advice to Barry but there is a catch. An epic battle begins with The Reverse-Flash against The Flash and Team Flash.

Barry must decide whether to let his greatest enemy die, or save his life.

Lois and Clark struggle as a couple. Chrissy adjusts to running The Smallville Gazette with Lois. Jonathan faces new challenges on the football team. Secrets threaten to destroy Jordan and Sarah's growing relationship.

Clark opens up to Lois about his ongoing struggle with visions and admits that there is only one person who might be able to help. Tensions being to rise with Lois and Chrissy. Sarah breaks plans with Jordan to spend time with Natalie.

Sara starts to realize her team is making questionable choices when it comes to the timeline. Sara discovers some harsh truths.

While Mary and Alice continue their sisterly bonding, Ryan, Luke, and Sophie are willing to do almost anything to stop them. Renee is forced to revisit her heartbreaking past.

Gideon jumps the time machine into the Manor Dimension. The crew of a 90's reality show causes havoc. Sara and Ava share their true feelings about their roles as co-captains. Behrad seeks advice about Astra from Nate and Zari.

The Legends are tired of being chased by an evil A.I. and her robo-soldiers, so Sara decides to create an aberration that will allow the team to take back the Evil Waverider.

Ryan, Sophie and Luke attempt to track down the original Poison Ivy when all signs point to Pamela Isley's reappearance in Gotham. Mary feels drawn by a powerful force. Alice suddenly feels very protective for her stepsister.

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

Lois reaches out to retired Gen. Lane. Clark's visions become worse during heated arguments with both Jonathan and Jordan. Lana shares her frustrations with Kyle.

Lois and Chrissy go on a mission to find Lois' sister Lucy. Jonathan and Jordan become more and more unsettled as Clark's painful visions continue.

The Legends break a fixed point, creating an aberration that will attract the evil Waverider. the Legends learn who has been hunting them. Sara tries to negotiate, which doesn't go as planned. Gwyn hatches a stealth plan.

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

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

Lana, Kyle and Sarah prepare for Sarah's quinceañera, but things don't end up going as smoothly as they had hoped. Clark finds himself struggling with feelings of guilt about what happened to John Irons.

Evil Gideon continues to try to destroy the Legends; trying to help, Gideon negotiates a deal, but she breaks a major rule. The Legends come up with another plan that could potentially solve all of their problems.

Lois tells Clark that she and Chrissy plan to do a deeper dive into the Inverse Society. Lana and Sarah try to comfort each other after the fallout at Sarah's quinceañera. Jordan notices something suspicious in Jonathan's book bag.

Gideon is horrified when AI Gideon tells her about Gary. The Legends realize that Gwyn has broken the treaty. Sara keeps an important secret from Ava because she doesn't know how she will react.

Batwoman and a panicked Bat Team must race against the clock as Marquis' nefarious plan balloons into something Gotham would never have suspected. A final stand-off between brother and sister puts Ryan's life and new love on the line.

Superman pleads with Lt. Anderson to investigate Ally Allston. Lois receives some very upsetting news. Lois helps Lana prepare to fight the good fight. Jordan is still irritated with Jonathan for lying to him.

Lois, Clark, and Natalie notice a difference in John Henry's behavior and fear something might be very wrong. Kyle encounters an awkward moment with Lana while stopping by the house to pick Sarah up for school.

Nora and Bart travel back to the future, only to discover that their actions in 2021 have altered 2049.

When a criminal invades the CCPD, Barry and Kramer must trust and rely on each other if they are going to make it out safely. Caitlin learns a valuable lesson while out with Snow and Mark.

Lois thanks Lana for sticking up for Jonathan when he is taunted for getting football season canceled. Jordan's unexpected departure on the mayoral election day leaves Sarah rattled.

Barry trusts his instincts during a murder investigation, believing the suspect, despite the overwhelming evidence against him. Iris gives Allegra an opportunity to be a mentor.

Barry and Team Flash get closer to figuring out the Fire Meta but no closer to finding him. Iris, needing a distraction, follows a story to Coast City.

Barry's desire to keep the team safe is tested when Frost recklessly courts danger while trying to stop the Black Flame. Iris tries to help a teen girl reunite with her mother but unintentionally does more harm than good.

Barry and Chester may have found a way to stop the Black Flame from hurting anyone else; Caitlin decides to handle a situation on her own, possibly putting more innocent lives in danger.

With a new Meta terrorizing the city, Joe lends a hand to the local authorities. Barry gets an assist from Cecile who helps to track the mass murderer.

Superman races through the portal after Ally Allston, but when he arrives on the other side, he discovers everything on this parallel earth is bizarre.

Jon-El catches sight of his doppelganger Jonathan. Jon-El lunges at him and Jordan tries to intervene, but Jon-El appears to be stronger and faster than him.

Team Flash is under attack, and each must fight to save not only themselves but each other.

Team Flash uses the distraction of a bank robbing Meta to detract from the grief of losing someone they love.

The Flash gets an assist from XS; CCPD enlists Chester for help when a mysterious device is found at a crime scene.

The Flash gets blasted with a shockwave forcing his body to age prematurely.

Jordan and Jonathan question whether Lois and Clark are telling them the complete story. Natalie tries her best to get Sarah to acknowledge Jordan.

Clark and Lois disagree on the best way to figure out if Ally Allston went to the Inverse World. John Henry makes a surprising discovery; Lois sets out to find Lucy.

Superman is rendered powerless by Ally's attack, and the others rally as the two Earths merge.

Chrissy Beppo, with the authorization of the Department of Defense, has a message for the people of Smallville, not only is the merging of planets real, it is happening.

The Flash goes off the grid to look for answers about a new Meta in town. Allegra tries to protect a friend at CC Citizen Media.

A new speedster in town gives The Flash more than he bargained for. Cecile's powers experience a growth spurt, allowing her to aid Team Flash on an entirely different level.

A fight looms for The Flash and team. Iris discovers the cause of her time sickness.

With The Flash still reeling from everything that just happened, the rest of the team rallies to support him when he needs it the most.