首季中Nick Cutter教授和他的团队在Dean森林调查时间异常情况，全美同时远古时代的恐龙也穿过异常点来到现在，全美这给小组的调查带来了更多压力和挑战。Cutter教授失踪8年的妻子Helen在异常点中穿梭往来，她究竟掌握何种真相...上季中，野心勃勃的Helen回到过去，妄图灭绝人类祖先。为阻止Helen紧追而去的Abby、Connor和Danny却被困在了远古… 先后出现的人员伤亡与失踪，使政府对ARC(异常点研究中心)失去了信心，在本季中，私人财团开始介入… 新的队伍将如何面对各种史前猛兽、可怕的未来生物? 迷失于远古的队员们又将何时回归呢?
回复 :两名倒霉的电视技术员无意间撞见谋杀现场。为了避免成为嫌疑犯，二人采取了行动，结果每一步都弄巧成拙。
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回复 :The fifth-year residents return for the first day of a year that will make or break their careers: Meredith faces the consequences of tampering with Derek's clinical trial and is terminated at the hospital; April tries to step up to the plate as Chief Resident in the wake of a giant sinkhole in the middle of Seattle; and Cristina and Owen are still at odds over their drastically different feelings for their unborn child.
