A group of pterosaurs have invaded Terra Nova, the creatures' apparent breeding ground created well before the settlers came to town. After attacking the camp numerous times, they use the pterosaurs' pheromones to lure them away from camp, so that the creatures can build a new breeding ground away from Terra Nova.
Meanwhile, an ex-boyfriend of Elizabeth comes to camp. Taylor tells Jim that this guy was actually the one who helped recruit Elizabeth to Terra Nova. They work together, but Elizabeth eventually makes it back home to Jim and the family.
Josh and Skye continue to hit it off, even though she learns about Josh's love for his girlfriend back home.