- The time is fast approaching for the Undertaking to occur and Malcolm Merlyn begins to tidy up the loose ends, beginning with the scientists at UNIDAC. Oliver and Digg trick Moira into telling just what the Undertaking is about. Oliver realizes that even if he manages to eliminate everyone on his father's list he has only, in his own words, eliminated the symptoms and not the disease. Felicity locates the UNIDAC device - sort of. Thea and Roy's relationship comes to head when they are unable to locate the vigilante. Walter files for divorce. Laurel and Oliver begin a new relationship. In a flashback to his time on the island, Oliver learns just what Edward Fyers' plan is.—garykmcd
- Malcolm Merlyn, in his archer costume, goes to Unidac Industries to tie up loose ends by murdering scientists that worked on the seismic device that will be used to level the Glades. Oliver and Diggle devise a plan where Diggle dresses as the vigilante and kidnaps Oliver and Moira in an attempt to uncover the truth about the Undertaking. The plan works and Oliver, Felicity, and Diggle break into Merlyn Global to hack the mainframe and find the device. Oliver convinces Tommy to get back together with Laurel, but when he learns that he could give up being the vigilante if he stops the Undertaking, Oliver decides to reconcile with Laurel himself; later, Tommy witnesses Oliver and Laurel becoming physically intimate. That night, Diggle goes after the device, but Malcolm learns of the system hack and has the device moved. The vigilante attempts to kill Malcolm, who reveals to the vigilante that he is the other archer; the two fight and Malcolm gets the upper hand, discovering Oliver's secret. Meanwhile, Walter reveals that he knew that Moira was part of his kidnapping and gives her divorce papers as a result. In a flashback, Fyers reveals that he plans to cripple the Chinese economy by blowing up aircraft going into China. Fyers then murders Yao Fei after forcing him to take credit for the attacks via video recording.—michelangelo55
- Oliver realizes that his mother must be involved in both husbands' dire fates and sets a trap to learn how much by pretending they're both kidnapped by the hooded Vigilante, actually impersonated by Diggle, threatening to torture them to death, but she maintains to have 'had no choice to save her family', so he 'escapes' with her, in time to be served divorce papers by Walter. Roy uses Thea's socialite status to look for the Vigilante, which just like Felicty's hacking and the police's leads ti the Merlyn HQ. Oliver uses a visit to buddy and embittered love rival Tommy to get to Malcolm's office while Diggle infiltrates security and Felicity diverts, but misses the window to prevent Roy and Thea getting in too deep, after which Roy rather risks loosing her then giving up on finding the Vigilante, whom he needs as a mentor. Oliver makes up and makes love with Lauren and dispatches Diggle to secure the seismic device, but the time he reenters Malcolm's office, hooded, for a face-off, it's already relocated and the fiend scarily well-prepared.—KGF Vissers
- Open with a masked man with arrows blowing through Unidac Industries, killing numerous scientists and security guards along the way.
Queen is struggling with the news about his mother and Malcolm. Digs thinks they have to find out what Moira's up to. Queen wants to confront her but Felicity thinks it's a bad idea.
Laurel tells Queen she's confused by him telling her he still has feelings for her. She wonders out loud if perhaps she still has feelings for him. He tells her nothing has changed.
Walter is back home. Thea notices he doesn't yet seem like himself.
Moira sees a news report about the massacre at Unidac, and that one of those killed was a world-renowned seismologist.
We see an island flashback. Fei tells everybody that Feyers was about to fire bomb the entire forest. Queen hears them talking about the fact a commercial airliner will be flying overhead in 25 minutes. Fyers' plan is to destroy it.
At the massacre scene Lance realizes that another copycat archer is behind what happened. Nobody who has any idea what was being worked on there is still alive.
Roy and Thea watch the building from a car parked across the street. Roy is still working on finding the vigilante. Roy has an idea for a way Thea can help him get info from the police.
Queen asks Moira who took Walter. He asks her to "let me help you, before you drown." The lights go out and they are both hit in the neck with tranquilizers.
Queen and Moira wake up tied to chairs.
Back in an island flashback Fyers tells us "my employer's" goal is to destabilize the Chinese economy by shutting down air travel. He's going to need Fei's (a rogue element from the Chinese military) help by taking responsibility for the attacks. Fei says no and Fyers starts shooting people.
Thea goes to the station and asks for case files on behalf of Laurel's firm. She has a court order. She overhears Lance talking about the "copycat" and the connection to Merlyn Global.
A hooded archer demands to know what is being planned. After knocking Queen around Moira admits the plan to level the Glades with an artificially created earthquake. Moira says there is no way to stop the process at this point. The archer (who looked a lot like Digs) unties their hands and leaves.
Queen, Digs and Felicity come together after the mission. Queen has Felicity look into Unidac and he tells her about the plan. They figure out the copycat is connected to Merlyn Global.
Back on the island we see that Fei goes along with Fyers' plan. Fyers makes a call that "it's happening," and we see the person is charge is a woman.
Moira walks in on Walter speaking with Malcolm. When Walter leaves the room she wonders angrily why Malcolm is there.
Tommy comes down to the station to speak with Lance as a representative of Merlyn. Laurel walks in as he is leaving. Lance is going to look into getting a warrant to look into Merlyn's computer records. Laurel tells her father about Queen being back in the picture.
Felicity can't get into Merlyn's system remotely. Queen wants to get her access to the company's headquarters.
Queen and Digs help Felicity sneak into Merlyn as someone making a delivery. Queen and Felicity use the elevator shaft to get to the mainframe on the 25th floor. Queen leaves for a meeting with Tommy, giving Felicity time to hack.
Queen speaks with Tommy about Laurel. Queen reminds Tommy that he can't be with Laurel, "and you know why." Queen says he didn't come between the two of them. Felicity is about to have security burst in on her before she can finish her download. She finishes her download but runs right into a security guard. Before Queen can help her he runs into his sister in the lobby. Digs, who has been posing as a security guard, runs upstairs and helps Felicity at the last moment. Thea tells Queen about Roy and the copycat archer. Queen warns Roy to stay away from the hood.
Roy tells Thea he isn't interested in Queen's opinion, calling Queen "a wimp." He wants the hood to teach him so he won't lose anybody else in his life.
Walter tells Moira he's fileing for divorce. He's well aware of her role in his captivity. Thea walks in the door and asks why Walter's leaving.
Lance's IT guy can't hack Merlyn's system, but found out that Felicity was doing the same thing he was. Lance now wants to know who she is.
Felicity thinks she should be able to locate the device, but it's going to take some time. Queen thinks Malcolm's plan is what he returned from the island to stop.
Queen pays Laurel a visit and hints that there might be a future for them on the horizon. They kiss and start tearing each other's clothes off. Tommy sees this from the street.
Later that night Digs calls Queen with word they've located the device in the Glades.
Back in the island flashback Fei records a video taking responsibility for shooting down the plane. Immediately afterwards Fyers shoots Fei in the head.
Arrow pays Malcolm a visit, telling him the "undertaking ends now." Digs tells him through an earpiece that the device has been moved. Malcolm tells Arrow he figures out somebody was in his system and took precautions. Malcolm says nothing can be done to stop his plan. The two get into a huge fight. Malcolm knocks Arrow out, then pulls back the hood and sees it's Queen. "Oh no," he says.
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