The team's former female colleague has secretly created a clone of Lindsay that possess rapid healing. Connor reappears and warns the team that the clone is actually a highly unstable and dangerous human-alien hybrid.
A terrified family man starts seeing demons and soon so does his wife. A desperate Englishman who seemingly appeared out of nowhere claims to be a farmer from the 17th century.
In this comical meta episode, Mia takes Lindsay to a rave night club that turns out to be a front for hungry vampire-like ghouls. Meanwhile, Peter must deal with an aggressive female TV producer who wants to make a TV show about the team.
A mysterious, deadly, ancient parasite that survived the Ice Age hidden in the frozen corpse of a Mylodon or giant sloth wreaks havoc at a remote Russian scientific outpost. The O.S.I.R. team is sent to help their Russian counterpart.
On a stormy night, a single mother discovers in shock the exact duplicates of all three of her pets and even her young son in their house. A little girl befriends what seems to be the ghost of a girl from the 1920s.
The statue of a headless soldier from the Terracotta Army given to a museum as a gift by the Chinese consulate comes to life and starts decapitating people.
Some kind of giant reptile is slaughtering people in Lyon, France. A farmer that lost his hand in an accident develops psychokinetic abilities but refuses to accept this fact.
Something is slaughtering NASA scientists and National Guardsmen sent to investigate a fallen meteor in a forest. The team's other case involves a family that's apparently become the victim of random apportation or teleportation.
A team of archaeologists discovers a strange, sealed, Egyptian tomb and begins suffering from a mysterious illness. A passenger plane caught in the storm is saved from crashing by what some claim to be a mystery woman.