Season 4, Episode 7:
Diggle: My brother needed me. The green one.
The team discovers that Diggle's brother is still alive, and seemingly working for Darhk, and tries to figure out how to save him. Meanwhile, Oliver continues his campaign for mayor, and Thea tries to control her resurfacing bloodlust.
- Aesop Amnesia: Averted. Oliver briefly considers making a deal with Darhk to infiltrate H.I.V.E. from the inside, but (A) he tells Felicity about this thought instead of just throwing himself into it like he would've before, and (B) she and John are quick to remind him that he tried the exact same thing with the League of Assassins in the last season, so he thinks better of it.
- Ambiguous Situation: It's not clear if Andy is in control of his own actions, or if he is under Darhk's mind control.
- Arson, Murder, and Jaywalking: Felicity's list of Oliver's bad ideas over the years dueling Ra's al Ghul, infiltrating the League of Assassins, and dating the Huntress.
- Asshole Victim:
- Malcolm attempts to invoke this by giving Thea a police file of a pedophile in the hopes that she'll use the opportunity to sate her bloodlust.
- Later on, this big surly type starts hitting on Thea in the middle of her date - and she beats the shit out of him.
- Back from the Dead: Heavily implied with Andy and the other ghosts, if Darhk's comments are anything to go by.Darhk: The people of this citywhat's left of them at any ratethey call you Ghosts. And they have no idea how right they are.
- Came Back Wrong: Implied with Andy. He doesn't even acknowledge his brother throughout the episode.
- Chekhov's Gunman: The last time we saw Andy Diggle was in episode 3x14. He returns in this episode, very much alive.
- Continuity Nod: Diggle commented on after seeing the existence of the Flash and the Lazarus Pit, he still couldn't believe that he's seeing Andy back alive.
- Continuity Snarl: Diggle says that Andy's been dead for eight years, but the flashbacks last season with Andy alive would have him dead for only five years.
- Conveniently Timed Guard: Just as Darhk is getting to the point where he would either explain or demonstrate to his new recruits if the Ghosts really are Back from the Dead, Andy and some guards abruptly appear and fire on the secretly observing Oliver and Diggle, preventing them (and the audience) from finding out.
- Dramatic Irony: Alex, when talking about how Oliver might know about the Office Romance, says he's glad Oliver isn't a killer. Thea in particular finds the statement awkward.
- Dynamic Entry: Ray arrives in the climactic fight scene by flying through the Ghosts, knocking them over, then landing and punching one in the face.
- Elevator Action Sequence: Thea has a fight with Andy that goes into, around, and then back out of an elevator.
- Eureka Moment: Thea realizes she can use Darhk's magic to help remove her bloodlust.
- Guest-Star Party Member: The Atom/Ray Palmer in this episode, much like Sara in last one.
- Leaning on the Fourth Wall: When asked how he is holding up about his brother's return, Diggle says there's nothing to compare it tothis week. Of course, it is the focus of that week's episode.
- Living Lie Detector: It is unknown how exactly Reiter knows that Conklin is lying, but he interrogates both Oliver and Conklin by holding a bundle of sticks towards their faces.
- Meaningful Look: Oliver is pointedly looking at Darhk during his news conference announcing the campaign policy Darhk wanted him to drop.
- Mythology Gag: The compound used to force obedience and destroy DNA markers is from Wolfman Biologics, named for comic writer Marv Wolfman.
- The woman Oliver didn't kill on the Island is confirmed to be Taina, a major supporting character from Green Arrow: Year One.
- No-Sell: Conklin attempts to lie to Baron Reiter regarding the death of Taiana's brother, but Reiter can tell he's lying. Later, Darhk's touch of death doesn't work on Thea, and actually seems to hurt him instead.Darhk: That usually works.
- Not So Different: Laurel brings this up about herself and Diggle. She is not exactly a stranger to siblings coming Back from the Dead who were members of organizations of killers.
- Offscreen Teleportation: Darhk, when Thea tries to run away from him. Justified, due to his magic.
- Oh, Crap!: Damien freaks out when he discovers his magic has no effect on Thea. And later when he realizes Oliver is not going to give in to his threats.
- The Oner: There are several nicely long shots during the episode's fight scenes, the highlight being Thea and Andy's elevator trip.
- Poor Communication Kills: Averted in this episode. Quentin tells Oliver that Damien Darhk might be on to him, and Oliver tells Felicity about being tempted to make a Deal with the Devil. This episode emphasizes that by talking about things with others, it can prevent unnecessary conflict later on.
- Public Secret Message: When Oliver makes his speech in the end, it is quite clear he is pretty much telling Darhk to "screw off".
- Race Lift: Taina, the woman Oliver saves from execution, is from the Green Arrow: Year One miniseries. There she's a Pacific Islander, on the show she's Russian.
- Shout-Out: Upon seeing her, Damien Darhk calls Thea Merida.
- Take a Third Option: Oliver decides that instead of using his previously-used strategies of battling the bad guys in secret and/or trying to infiltrate their organization to take it down from within, this time he's going to drag the battle out into the daylight and expose the bad guy to the world.
- A Taste of the Lash: The fate of Conklin at the hands of Oliver (on orders of Baron Reiter) for his part in the death of the worker from the previous episode. The whipping torture was so horrifying that Reiter's men had to turn away from watching.
- That Came Out Wrong: As usual for Felicity when talking to Oliver at the formal event, but she doesn't even seem to notice.
- Too Spicy for Yog-Sothoth: When Darhk tries to kill Thea with his magic, her Lazarus-induced bloodlust not only keeps it from working, but causes it to hurt him.
- Villain Ball: Reiter has a way to detect if someone is lying to him. Never seems to think of using it to see if what Conklin is accusing Oliver of is true.