When an orphaned "Sixer" girl comes to Terra Nova seeking asylum, Jim and Shannon are at odds if they can trust her; Mira plots to reclaim a valued possession; Taylor begins to suspect there is a traitor in his midst and Reynolds admits his feelings for Maddy.

The colony falls victim to its first murder, and Jim and Taylor must find the perpetrator. Also, Skye helps Josh find a way to get Kira, his girlfriend from 2149, to the past, while Elisabeth and Zoe race to help an unborn Ankylosaurus survive.

Crashing meteor wipes out all technology and wreaks havoc on the colony. Meanwhile, Maddy and Reynolds are stuck out in the wilderness, Elisabeth and Skye work together to save a life and Taylor tries to prevent Mira and the "Sixers" from invading Terra Nova. Also, a mystery man makes his presence known.