The Best Episodes Directed By Dermott Downs

Wells presents Barry with a life-changing choice. Dr. Martin Stein and Ronnie Raymond return to help the S.T.A.R. Labs team with this final fight.

When the Tomorrow People learn the truth about the serum they were injected with, Stephen and Cara attempt to buy time for Jedikiah while he tries to create a possible antidote. Growing impatient, Russell and the other rogue Tomorrow People make a rash decision to sacrifice Roger to Ultra for their own safety. Meanwhile, John is having a hard time figuring out his new role and the only one he can turn to for advice is Astrid.

After Bode requests to be transferred to a different city, his future in Edgewater hangs in the balance. Meanwhile, the crew joins forces to protect the town from a treacherous storm.

The team hunts for a kidnapper when an emaciated boy is found in the desert and another goes missing.

Stephen feels uneasy about his fellow trainee Hillary who has a secret agenda of her own. Stephen's mom wants the family to go camping including her new boyfriend Peter, whom Stephen seems to be having a difficult time reading. Knowing he is going to be out of town, Stephen asks for Cara and John's help to make sure that everything is ok with Astrid while he's gone.

Fed up with Jedikiah’s constant lies about his father, Stephen makes a choice about his alliances. Trusting in Ultra and Hillary, Stephen wants to bring in a break-out to Ultra to see if things have really changed, much to Cara’s dismay. Meanwhile, Stephen’s brother goes missing after Jedikiah forces Stephen to protect him.

After Klaus and Elijah receive a cryptic invitation to dinner from their mother, they get ready to expect the worst.

Klaus must put aside his mistrust for Freya in order to save Rebekah's life.

Nikita is stunned when she hears that her old Division partner Kelly escaped from a Turkish prison. Nikita thought Kelly died years ago and always felt responsible because it happened on the mission where Nikita escaped from Division. Knowing Amanda will go after Kelly, Nikita tells Michael they have to go to Turkey to help her. Amanda sends Alex and Roan to Europe to stop the former partners from reuniting.

Stephen is still walking a fine line with his Ultra partner Hillary, who continues to be suspicious of his loyalties. When the Tomorrow People and Ultra learn that there is a new break-out doing good for humans, they both want her on their side. Meanwhile, Morgan takes a risk and betrays Jedikiah’s trust to help the Tomorrow People, but what Jedikiah discovers from Morgan is an even bigger surprise.

An UNSUB who kidnaps families with the intention of making them admit to and pay for their indiscretions.

When aliens called the Dominators attack Central City, Barry speeds over to Star City to ask the Green Arrow for help in stopping them. Realizing the battle against the Dominators is bigger than they thought, they track down the Legends of Tomorrow, and Barry and Cisco create a breach to bring back a secret weapon – Supergirl. Once all of the super friends are assembled, they come up with a plan to attack but a shocking secret related to Flashpoint is revealed and suddenly no one is sure who they can trust. Meanwhile, Wally wants to join the battle against the aliens but Iris tells him he’s not ready. The crossover starts on Supergirl S02E08 Medusa (I). It continues on Arrow S05E08 Invasion! (III) and DC's Legends of Tomorrow S02E07 Invasion! (IV).

Despite Gil's fatherly concerns, Bright throws himself into a new case involving an escalating killer that has Edrisa's online vigilante group, known as the "Killabustas," trying to stop him. Meanwhile, Jessica realizes that she must dive deep into her past traumas in order to write a book and may need Gil's help to do it. Then, Martin's relationship with Dr. Capshaw intensifies.

Chucky reminisces about his first murder, urging Jake to make a choice -- kill or be killed.

After the numerous sacrifices the team has made since the beginning of this ride, Rip decides that it’s time they each decide their own destiny and returns them to Central City a few months after they first left. Returned to their normal lives, each team member must individually decide if they are willing to sacrifice everything in order to save the world. Meanwhile, Sara visits with her father who delivers some heartbreaking news about her sister.

When Damien Darhk and Malcolm Merlyn try to capture Rip Hunter in 1967, they create an Aberration big enough to draw the attention of the Legends. However, when the team arrives they discover that Rip has no memories of his past due to “time drift” and is just a graduate film student. After trying to convince Rip of who he was, they discover that he possesses an incredibly powerful artifact known as the Spear of Destiny, which the Legion of Doom is after. Ray and Nate realize that the Aberration has also affected them personally making it difficult to help the team. Meanwhile, Rory asks Stein for help and makes him promise to keep it a secret from the team.

Following Mr. Nobody’s capture of The Chief, the Doom Patrol investigate the mysterious albino donkey and discover it’s a door to another universe, where Mr. Nobody is in control.

When an up-and-coming ballet dancer is mysteriously poisoned, the NYPD dives deep into the rigorous world of dance. Meanwhile, Jessica reunites with an old friend, socialite Nicholas Endicott, and Bright and Eve turn to Martin for answers regarding the girl in the box.

Liv eats rotting brains to get a lead on the murder of an agoraphobic Internet troll and MMORPG player. Meanwhile, Major continues looking into Jerome's disappearance, and Eva makes the acquaintance of Meat Cute's owner.

Special Agent Avery Ryan and her team investigate when a man dies after taking medication he purchased from a hacked ad on a medical website.

The Legends plan to vanquish Mallus by using the totems doesn't go as planned, forcing Rip to improvise. The team finds itself regrouping in the Wild West where they run into their old pal Jonah Hex. Sara leaves Ray in charge of watching Damien Darhk, while she comes up with a new plan. Meanwhile, Amaya is determined to find a way to use the totems to destroy Mallus.

Chucky targets one of Jake's frenemies, forcing Jake to either stop the killer doll – or help him.

Malcolm puts Oliver and Thea in a dangerous situation that lands them on Lian Yu with Oliver's former enemy Deathstroke. In a flashback, Oliver and Maseo return to Starling City to retrieve the Omega bio weapon.

Dorothy and the Candlemaker finally face-off, while the Doom Patrol – now freed from their wax encasings – face troubling side effects. Rita holds the key, but is she ready to answer the call?

The Doom Patrol go their separate ways in the season finale.