The storyline takes a dramatic turn with the introduction of the Salamanca twins, who seek revenge for their cousin Tuco's death. This plot thread, along with Gus Fring's meticulous planning, keeps viewers on the edge of their seats. The season culminates in the dramatic confrontation at the end of "Fly," setting the stage for a pivotal shift in power dynamics within the methamphetamine trade. The fourth season witnesses the rise of Gus Fring as a dominant force in the methamphetamine trade, culminating in a cat-and-mouse game with Walter. Gus's cold demeanor and calculated approach to business present a new challenge for Walter and Jesse, who find themselves caught in a perilous game of survival and loyalty.