Fulfilling a promise to his deceased father, one-time outlaw Jesse Custer returns home to West Texas to take over his dad's church. Jesse's mission, however, becomes twisted when his body is overcome by a cryptic force that unleashes within him a highly unconventional power. Together with hell-raising ex-girlfriend Tulip and Irish vagabond Cassidy, the preacher-in-training embarks on a journey to find God in a world inhabited by holy, hellish, and everything-in-between characters.

High school chemistry teacher Walter White's life is suddenly transformed by a dire medical diagnosis. Street-savvy former student Jesse Pinkman "teaches" Walter a new trade.

Season one takes place between March and November 1960. It introduces the fictional advertising agency Sterling Cooper. The season begins with the new secretary, Peggy Olson, starting her first day with the firm. As the season unfolds, the mysterious backstory of enigmatic ad man Don Draper is revealed as are the growing confidence and success of Peggy Olson.