I am the DANGER.
When Hank found Gale’s copy of Leaves of Grass inscribed to Walt, we knew the DEA agent would soon reveal that his brother-in-law is the infamous Heisenberg. Most shows would drag out this development for half a season, but Hank attacked Walt in the Schrader family garage before the conclusion of first episode.
There is no more Walter White. There's only Heisenberg.
Walt shows off how a chemistry teacher can rule the streets. Passing off fulminated mercury as meth to fool Tuco and blow his hideout was one of the coolest attacks Heisenberg planned.
Jane's was one of the more disturbing on the show. Bryan Cranston steals the scene however as he shows Walter's guilt and regret for not saving Jane. Unfortunately, this isn't even the worst thing to happen to Jesse.
In "Breaking Bad"'s last moments, Jesse finally gets a happy ending. His face says it all.
The shock and brutality of this scene is unparalleled in the series. Nobody in the show or watching at home knew what Gus was going to do. The tension building as he slowly dresses only made the sudden murder that more shocking.
Gustavo Fringe was probably the best villain through the series. He was also given the best and most satisfying death. Rest in Peace, Gus.
Guilty of nothing but caring for Jesse, Andrea is murdered in cold blood by Todd—who proves himself every bit as much the sociopathic sadist as his Uncle Jack. And we see that expression again of anguish once more, this time on Jesse’s face.
"You clearly don't know who you're talking to, so let me clue you in. I am not in danger, Skyler. I am the danger. A guy opens his door and gets shot and you think that of me? No. I am the one who knocks!"
Hank nearly succeeded in this task before eventually getting caught up in an intense gunfight with Jack's White Supremacist Gang in which fellow DEA Agent and friend Steven Gomez was killed in the midst of the chaos. Despite Walt's pleas, Hank was shot and killed.