1.: Seven Thirty-seven

After witnessing Tuco Salamanca brutally beat his henchman No-Doze to death in the previous season's finale, Walt and Jesse realize they are in extreme danger.

Fearing for their lives, Walt proposes a plan to kill Tuco using ricin, a potent toxin. 1. Seven Thirty-Seven

The episode ends on a cliffhanger as Tuco abducts Walt and Jesse at gunpoint, leading directly into the next episode, "Grilled". After witnessing Tuco Salamanca brutally beat his henchman

The title has a dual significance that layers immediate plot goals with long-term foreshadowing: leading directly into the next episode