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.

Mysteries abound on the first season of LOST as the survivors of Oceanic Air flight 815 find themselves stranded on an unidentified island with little hope of rescue.

许多超能力者在得到超能力后，仍试图变回平凡人，过普通人的生活，但神秘组织H.R.G和“食脑人”赛勒（扎克瑞·昆图 Zachary Quinto 饰）却不肯放过他们。“啦啦队长”克莱尔（海顿·潘妮蒂尔 Hayden Panettiere 饰）和养父班奈特（杰克·科曼 Jack Coleman 饰）一家隐居在加州，却发现同学里也隐藏着H.R.G成员；“分裂女”妮基（阿丽·拉特尔 Ali Larter 饰）一心带着儿子过正常生活，却发现被人监视；主动“核爆”的皮特（米洛·文堤米利亚 Milo Ventimiglia 饰）带着神秘伤疤又回来了，好像变成了另一个人，和哥哥内森（Adrian Pasdar 饰）的纠葛也在继续……