The first episode of the second half of the final season, aka Season 5B (During its original broadcast, there was an 11-month gap between 5A and 5B.)
An older, disheveled Walter White returns to his old home, 308 Negra Arroyo Lane. In the time since he was last here, the house has fallen into disrepair. The empty swimming pool is used by skateboarders as a miniature skate park, sneaking their way past the fences that had been built up around the house. Inside, the house is completely bare, all except for graffiti adorning the walls, including the name "Heisenberg" in large yellow letters. Walt has a reason to be here after all this time, however: to retrieve his vial of ricin.
As he leaves, he catches the frightened gaze of his former neighbor, Carol. He greets her as she, shocked at Walt's return, drops her groceries...
Picking up from "Gliding Over All", Hank has just discovered that his brother-in-law Walt has been Heisenberg all along. He returns to the rest of the family out back, and quickly makes an excuse to leave. On the way home with Marie, he suffers a panic attack and has a mild car accident. Later that night, he compares Gale's handwriting in Walt's book to that in Gale's notebook, confirming that they are identical. For the rest of the episode, Hank digs through boxes and boxes of files, looking for evidence.
Meanwhile, Walt is working at the car wash with Skyler. Lydia stops by and tells Walt that ever since he left the business, their meth purity has dropped drastically, and she asks for his help. He refuses. As she's leaving, Skyler warns Lydia never to return.
Jesse is still depressed over the death of Drew Sharp. He brings Saul the $5 million that Walt gave him in the previous episode, and asks him to give half to Drew Sharp's parents, and the other to Mike's granddaughter Kaylee. Saul later tells Walt about this, who then brings Jesse's money back to him, insisting that Jesse should keep the money. Jesse as much as reveals that he knows Walt killed Mike, but when Walt insists that he didn't, Jesse relents, possibly out of fear that Walt will kill him too. Eventually, his guilt gets the better of him, and late at night, he drives through the city, tossing his money out of his car window into random yards...
Walt discovers that his "Leaves of Grass" book is missing. Skyler mentions that Hank has been home sick all week long, ever since their party. Walt then discovers a GPS tracker on his car. Putting two and two together, he realizes that Hank is finally onto him. He visits Hank at home the next day to ask how he's doing. However, as he's leaving, he decides to question Hank about the GPS tracker. Hank then becomes enraged, punching him in the face, and recounting a handful of the horrible things which he now knows Walt was behind. Walt admits nothing, but declares that even if Hank is right, Walt will be dead long before he ever had a chance to be convicted; his cancer has returned, and this time is inoperable. The episode ends with Walt growling at Hank that if he really wants to go after him, he should "tread lightly."
This episode contains examples of:
- When Lydia comes into the car wash to discuss matters with Walt, he gives her the same treatment that Gus gave him at Los Pollos Hermanos.
- Walt lays a towel in front of the toilet for his knees before he vomits, just like Gus did in "Salud" — though only by coincidence, as there's no way Walt could have known that Gus did this.
- The montage of Hank sifting through evidence contains numerous callbacks to previous episodes, including photos of Mike, Tyrus, Gale, and Tio, among others; and even a Heisenberg drawing. He also looks at the surveillance footage of Walt and Jesse stealing the methylamine barrel, from way back in Season 1.
- Hank's neighbor with the remote-controlled car reappears for the first time since the second season premiere.
- The GPS tracker Hank plants on Walt's car is the same one Hank had Walt place on Gus's car.
- Cold Open: Like the previous season premiere, this episode opens with a flash-forward to Walt on his 52nd birthday. This time, he returns to his home (which is apparently abandoned) to retrieve the vial of ricin he hid there in an earlier episode.
- Foreshadowing: Badger's Star Trek script may foreshadow some of the events of the final season. Badger claims that the crew of the Enterprise are having a pie eating contest, and that it is down to just three: Kirk (Hank), Spock (Walter) and Chekhov (Jack). Kirk is the first to leave, foreshadowing Hank's death in "Ozymandias". Chekhov has Scotty (Todd) helping him, but when Uhura (Lydia) walks in, Scotty accidentally gets Chekhov killed, leaving Spock as the winner. If Todd hadn't become attracted to Lydia, Walter likely wouldn't have killed Jack and his gang, as they had to keep Jesse alive in order to keep making the meth, prompting Walt to go after them.
- Freeze-Frame Bonus: When Hank is looking through all the case files related to Heisenberg, when he is looking at the photos of Combo's dead body, if you look to the left you see a picture of him as a little kid. About 7-9 years old, chubby and has a mullet.
- Get Out!: Skyler tells Lydia to never come back, and she's deadly serious.
- Heroic BSoD: Finally finding out that Walt is Heisenberg absolutely floors Hank. His panic attacks come back with a vengeance and he is emotionally wrecked by the time Walt confronts him about the GPS tracker.
- Implied Death Threat: Walt gives a rather sinister one to Hank at the end of the episode.Walt: "...if it's true...if you don't know who I am...then maybe your best course would be to tread lightly..."
- Oh, Crap!: Walt has this moment when he finds the bug on his car and realizes that Hank knows his secrets.
- Wham Episode: A BIG ONE. After five and a half seasons, Hank finally confronts Walt, having discovered that he was Heisenberg all along. The episode ends with Hank declaring he'll do whatever it takes to put Walt behind bars. In response, Walt reveals that his cancer is back - but makes it very clear that he's not going to go down without a fight.
- Wham Line: "If you don't know who I am, then maybe your best course would be to tread lightly".