After Sara, Ava, Behrad and Gary arrive in New York City, they track down Dr. Gwyn Davies, who isn't the scientist they expected. Astra, Spooner, and Gideon are still trying to stop the Legends from using the time machine, but they run into some more setbacks along the way. Meanwhile, in the pocket dimension Nate and Zari work together on the Hoover situation as well how to make their future together work.
Tropes:
- Accidental Kidnapping: An unnamed carjacker steals Erwin Baker's car, not knowing Gideon is in the back seat. She promptly knocks him out.
- Ambiguously Gay: It's heavily implied that the person Davies wants to save is a man, by the way he reacts to Sara having married a woman.
- Bad Cop/Incompetent Cop: The cop that stops Erwin Baker for violating numerous speed limits gets convinced to just let him go after they promise that they will mention his name as "the cop who gave Cannon Ball a police escort to the county line".
- Big Blackout: Astra summons a lightning storm to short out a nearby power line and take the power out of the city, just in time to stop the Legends from activating the time machine.
- Butterfly of Doom: Whoever programmed Robo-Hoover did so to prevent the Legends from further changing the timeline.
- Chekhov's Gun:
- Spooner's "lucky rock", even if it was just a Magic Feather, is used by Gideon to knock out a carjacker.
- Zari extracting a blue chip from the robot Hoover, which later becomes the new power source for Davies' time machine.
- Comically Missing the Point: Gideon, once more, when Spooner complains to the heavens why they can't bring them good luck, Gideon curiously asks who is up there, even introducing herself to the sky.
- Decoy Damsel: Sara pretends to be Davies' hostage so they can escape Bellevue.
- Flat "What": Ava's reaction to learning Zari and Nate killed Thomas Edison.
- From Bad to Worse: Robo Hoover blows up from a conflict in programming just when Zari and Nate managed to retrieve Davies' time machine plans without a hitch. The shock of this induced a heart attack in Thomas Edison, which alerted Bishop's Waverider to the fact that the Legends are still alive and leads to a replacement Hoover and replacement Edison being sent.
- Good Thing You Can Heal: Sara gets shot in the stomach by a shop owner who recognizes her, but she quickly heals up.
- Heel–Face Brainwashing: Sara tells Zari to reprogram the robot Hoover into helping them.
- Hero Antagonist: Edison, who stops Gary from taking something from the Part Department and then has Davies arrested for stealing from the company, thinking of him as a madman.
- Historical Domain Character:
- Spooner, Gideon, and Astra hitch a ride with Erwin George Baker, famous for his cross-country drives and eventually becoming the first commissioner of NASCAR.
- Gary runs into Thomas Edison himself when searching for the part needed for the time machine.
- Ignored Expert: Ava being cautious about causing too many footprints ends up being proven exactly right, as she and Gary are almost Ret-Gone'd out of existence. Sara admits that she was too rash again.
- I'm a Doctor, Not a Placeholder: When they're running through the hospital halls, Davies tells Sara that he is a scientist, not an athlete.
- Internal Reveal: Gideon tells the rest of the Legends what she, Spooner and Astra have been up to during the last few episodes.
- Irony: Nate wonders why anybody would hunt them in order to preserve the timeline, because that is their job....while they are once more screwing it up instead.
- Leaning on the Fourth Wall:
- Behrad gushes about how they're finally in New York, sharing the sentiments of some fans for how long it took for them to get here.
- Sara and Gary remark that Davies (played by Matt Ryan, who was also Constantine) looks familiar to them, but confuse him with a young Stein and Mick, respectively, instead. He later even gets confused with Ray.
- Zari lampshades just how many convenient things are in John's attic.
- Logic Bomb: While Zari managed to reprogram Robo Hoover to assist them, eventually it conflicts with his original program and leads to a critical breakdown.
- Magic Feather: Astra supposedly puts a luck spell on a rock, but later she admits that she made it up to give Spooner confidence.
- Nice Job Breaking It, Hero: Once again, the Legends' attempt to get home without changing the timeline fails spectacularly. First they manage to prevent the invention of time travel and when fixing that error, they accidentally kill Thomas Edison.
- An Offer You Can't Refuse: Sara holds a scalpel to Davies' neck when the latter refuses to escape Bellevue.
- Percussive Pickpocket: How Sara steals Davies's plans.
- Ret-Gone: Ava, Gary (and the Time Bureau manual) temporarily blink out of existence when the Legends accidentally prevent Dr. Gwyn Davies from making his maiden time-travel voyage - thus erasing the history of time-travel and preventing the Time Bureau from ever having existed.
- Running Gag: Several of the Legends remark that Dr. Gwyn Davies looks familiar. They list various past Legends (including Ray, Mick, and Stein), hilariously not mentioning the one past Legend he does resemble.
- Set Right What Once Went Wrong:
- The Legends need to break Dr. Gwyn Davies out of Bellevue Asylum, and retrieve his time machine blueprints confiscated by Edison, in order to get the history of time-travel back on track and restore Ava and Gary to existence.
- Astra, Spooner and Gideon finally succeed in their mission to prevent the Legends from blowing up in Gwyn Davies' time machine.
- Gwyn Davies tells Sara that he invented his time machine in order to save someone he lost.
- Shout-Out: When Edison dies of his heart attack, he shouts "Great Scott!"
- Spotting the Thread: Robo-Hoover immediately notices Zari just acting to be happy over Nate's suggestion to move into John's pocket dimension. She later confesses to Nate that she wishes to stay within the Totem.
- Stock Scream: Robo-Hoover dies with a Wilhelm scream.
- Teleportation Misfire: Though the Legends succeed in making Gwyn Davies' time machine functional, they end up in a random forest instead of their destination of 2021 civilization.
- Tomato in the Mirror: Robot-Hoover seems to deny this, accusing Zari of subversion whenever she confronts him with the fact that he is not the real deal. The second Robo-Hoover however seems to be aware of this.
- Unusually Uninteresting Sight: Erwin Baker barely reacts to his car being stolen at all. Instead, he just takes the bicycle of the car jacker and tries to still break his record that way.
- We Need a Distraction: Sara gives Davies a whole staple of projects to walk through while the Legends attempt to finish his time machine.
- Wham Line: Robot Hoover's preeminent directive over assuming the real Hoover's duties in history? "Exterminate the Legends."
- Verbal Backspace: When Sara offhandedly mentions that the Tarazi siblings might not actually be able to built a working time machine, she quickly tells them "No offense." Behrad doesn't mind, but Zari is "slightly offended."
- Wrongfully Committed: Davies gets committed to an mental institute by Edison, where Sara has to break him out.
- Your Princess Is in Another Castle!: With the help of Dr. Davies, the Legends finally have access to a time machine, and they plan to go to Tahiti 2021 where they can find a Time Bureau outpost. Unfortunately, the time machine sends them somewhere else entirely, which Sara believes is not Tahiti.
