- While Sarah and her group prepare to use Davies' time machine, Spooner, Astra, Gideon rush to save them before it's too late.
- 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.—The CW
- Gary arrives on the train in NYC, finds a door to use the key on, and tells the Legends that they've arrived. Sarah, Ava, and Behrad come out, and Sarah tells Gary that Nate and Zari are tinkering with the Hoover-Bot. They find food and buy ice cream and pizza, and the vendor asks where they're from. He recognizes the "Bullet Blondes" and fires a shotgun at Sarah, blasting her back. Behrad takes the vendor out with the totem, while Sarah's wound heals.
Zari opens up the bot's head and looks inside. She hooks up a device to the socket on its head. When Nate comes over, Zari tells him that the bot's coding is like Waverider's, and it has chips similar to the ones on the timeship. They figure the two are connected, but Nate points out that they still don't know who is responsible.
Nate has donuts, and the others come in. Sarah says that they're fine, and the Blondes are still front-page news. Zari mutes Hoover when he talks about the vendor is a patriot, and Gary talks to Nave about his relationship issues. When Zari notices, they dismiss their conversation as nothing. Sarah finds Edison Labs where Davies is working, and they figure that once they find him, they can use his time machine to leave 1925. Sarah tells Ava that the latter is staying, because she's the only one of them that can take bullet shops. Ava agrees but warns her not to leave temporal "footprints".
Sarah and Gary go to Edison labs, and figure Davies is the geeky looking one. Sarah approaches him, but Davis interested in socializing with her Sarah "accidentally" knocks Gwyn's case out of his hands, and secretly steals his plans for his time machine.
Spooner, Astra, and Gideon walk down the highway, because they haven't been able to hitchhike. Gideon calculates that it will take them two weeks to walk to NYC. They put up their thumbs when a car comes by, but it doesn't stop. Astra picks up a rock and performs luck spell. The next car that comes by stops.
The Legends go over the time machine plans, and Behrad figures that it will four or five years to build it. Sarah figures they'll never get back to 2021, and Ava tells Sarah to slip Gwyn's files back into his apartment so they don't disturb the timeline. Sarah agrees and leaves with the plans.
Sarah breaks into Gwyn's apartment, where Gwyn is sleeping on the couch. She plants the files, then discovers that Gwyn has already built a prototype
Sarah goes back to the manor and joins the others, and tells them what she saw. Behrad says that according to the plans, Gwyn is missing one part. Gary babbles on about loving, and Zari figures that he's hitting on Nate. Behrad figures the part is at Edison Labs. When Ava objects to the possibility of altering time, Sarah says that they can risk a footprint in return for getting back to their own time five years early. Ava points out that according to history, Gwyn never built a time machine. Sarah proposes that they travel back to their own time, come back via time couriers, and return the machine to Gwyn before he notices that it's gone. Ava reluctantly agrees.
The car's fear breaks down so they can only drive 20 miles an hour. Gideon calculates that they have to travel 55 miles an hour to get to NYC. When Spooner uses stone, George Erwin "Cannon Ball" Baker pulls up. Spooner recognizes him as a cross-country race-car driver because she's a big NASCAR fan in the future, and Cannon Ball says that he's racing to NYC. Gideon knows the directions and recites them, and George says if they get him to the highway then he'll take them to NYC.
The next day, Sarah and Gary go to Edison Labs. Sarah tells Gary to find the part, while she makes sure Gwyn stays at the lab. She steals a card of books and goes into Gwyn's office, and starts dumping folders on his desk. She says that they want Gwyn's opinion on the projects is best, Edison wants it.
Gary goes through the storage room looking for parts, and finds what he's looking for.
At the manor, the bot still continues to talk like Hoover. Zari hacks the bot's processor and finds an order to eliminate the Legends. Ava wonders if the person who sent the bot is protecting the timeline, and warns that any "footprints" they make will lead the person to him.
Thomas Edison comes into the storage room and finds Gary. Gary claims that he's a doctor, and Edison ask who his supervisor is. When Gary says that Gwyn is his supervisor and it's for his time travel project, Edison calls security and tells them to meet him at Gwyn's office.
In Gwyn's office, Gwyn complains that going through the folders will take all night. He starts muttering to himself, just as Edison and his men come. Edison tells his men to take away everything, finds Gwyn's part, says that his time travel project is a waste of time. When Gwyn rants about how time travel is his divine mission, Edison tells security to take Gwyn to Belleview because he's clearly insane.
George comes to a police blockade and stops. The officer says that they've received cars the last ten times over about a speed demon. George introduces himself, but the officer doesn't care and tells George to hand over his license. Astra grabs the rock and says that Gary is breaking records racing across the country, and suggests that the cop let them go and give George an escort to the country line. The officer steps aside and George drives off.
Nate is relaxing on the sofa, and he tells Zari that he had a conversation with Gary about them. He admits that he's using the totem to keep them apart, and Zari figures it's time for the "talk". Nate suggests that in the pocket dimension where the manor is, both Zaris can exist when they would normally cause Behrad's head to explode. Zari agrees and Nate goes to get donuts.
The bot has heard the entire conversation, and tells Zari that he knows she just lied.
Ava and Sarah are checking out the time machine with Behrad and Gary, and Ava finds a calendar saying Gwyn was going to use the machine that night. Behrad puts in the missing part and activates the time machine, and first Ava and then Gary disappear. When Behrad takes the part out, the missing people don't return. Sarah figures that they created footprints and made the Time Bureau disappear, and figures they have to have Gwyn use the time machine like in the original timeline. She figures they have to get the plans from Edison by 7 pm that night, and need everyone they can get.
Going to the manor, Sarah tells Zari to replace Edison's kill order with a mute command orders to do as they say. Nate goes to John's attic to get clothes so they can blend in, and Sarah asks him to look for a lab coat.
Later, Sarah, wearing the lab coat, breaks into Belleview and finds Gwyn strapped to a bed. She tells Gwyn that she's a time traveler, and knows that Gwyn's maiden voyage in the machine in the night. Gwyn refuses to go with her, and says that he built his time travel for a sacred purpose. He calls for the guards, and Sarah puts a knife to his throat and tells him to be quiet.
Sarah makes Gwyn promise to stop screaming in return for his silence. He agrees and has a panic attack, and Sarah tells him to focus on his breathing. Once Gwyn calms down, Sarah apologizes for treating him like a pawn rather than person, and tells Gwyn that he invented time travel and he helped her meet and marry her wife. Gwyn is surprised, and Sarah says that now she has a sacred purpose to bring Ava back, and she can only do it when Gwyn's help. Sarah tells Gwyn that she's done lying to him, and Gwyn says that he can understand using time travel to save a loved one. He asks Sarah to help him save his loved one in return for her help, and Sarah has no choice but to agree.
Zari and Nate take the bot to Edison Labs, with orders to help them get Gwyn's plans. They go in and meet with Edison, and Edison hands over the plans. As they go, Edison figures that Hoover has something important on his agenda nearby. The bot malfunctions and then blows up, metal pieces flying everywhere. Edison has a heart attack and dies.
A doctor and nurse spot Gwyn and chase after him and Sarah as the latter run.
Nate and Zari pick up the bot pieces to try and figure out who sent it. Zari figures that the bot blew up because it was pulled in two different feelings, just like their relationship. She tells Nate that she wants to live in in the totem, not the manor, because she found a family there and it feels like home. Nate asks for a little time to digest moving into the totem, and Zari agrees. A bright light from the rogue Waverider shines in through the window and Nate figures it's too late to get clear.
Sarah and Gwyn run into a dead-end corridor, and Sarah reminds Gwyn that he's a genius. When their pursuers, Gwyn pretends to hold Sarah hostage to get them to let him past.
Robot Hoover and Edison come into the room and figure they have to clean up the bodies. Zari and Nate are hiding beneath the desk.
George stops for a "pit stop" and Spooner and Astra go for a walk. A bicyclist and steals the car with Gideon in it, as Spooner realizes that she misplaced the rock. George borrows the thief's bicycle and goes after the car, still figuring he can make his goal in time. Spooner and Astro see NYC in the distance.
Sarah takes Gwyn back to his apartment, and Nate and Zari have gone there as well and are sorting through the bot parts. Gwyn strokes his time machine, while Nate tells Sarah that Edison is dead. Zari says that they have the plans, and Behrad tells Gwyn that he has to assemble the time machine to get time back on track.
Gwyn inserts the part, and Ava and Gary reappear. Sarah apologizes to Ava for not listening to her, and Gary joins in until they tell him not to. Gwyn invites them into the time machine.
As night falls, Astra says that she made up a luck spell to make Spooner feel better. She says that their luck came from them, not magic, and they have to make their own luck to stop the Legends from blowing up in five minutes. Spooner gets an idea and leads Astra to a nearby electrical tower.
Gideon wakes up in the back of the car, and the thief knocks her out with the rock. She figures she still have five minutes to save her friends.
Everyone gets into the time machine and Ava says that they're a safehouse in Tahiti 2021. Gwyn asks if Sarah will keep their deal, and Sarah assures him that she will. Nate and Zari tell Ava that they killed Edison.
Gideon gets into NYC, tells the rock to give off luck, and starts running.
At the electrical tower, Spooner tells Astra to zap it with a lightning spell, overloading the grid and preventing the Legends from turning on the time machine.
Gwyn activates the time machine.
Astra casts the lightning spell and overloads the grid.
Gideon runs through alleyway and into Edison Labs.
Gwyn starts the time machine, and Gideon runs in and yells at them to stop.
Astra collapses from the strain, and she and Spooner watch the lights go out through NYC. They run to Edison labs, and find Gideon telling the Legends how she ended up there. They all have a group hug, and Gwyn wonders how many time travelers there are.
Spooner and Astra tell the others how they started the blackout, and Behrad tells Astra that they have an infinite amount of liquor.
Sarah and Ava talk privately, and Sarah worries what will happen if Ava disappears again. She says that when she lost Ava, she lost her safe place. They kiss as the power comes back up.
Gideon why the time machine almost blew up, and the necessary part won't be invented for 300 years. From Gideon's description, Zari realizes that the chip in the bot's head is the one they need. They put it into the time machine and Gwyn starts it up. The rogue arrives outside, and Gwyn sends the time machine to Tahiti 2021. It lands in a forest that no one recognizes, but they're sure it isn't Tahiti.
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What is the Spanish language plot outline for It's a Mad, Mad, Mad, Mad Scientist (2021)?
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