Following the dramatic shift in violent animal behavior, the team attempts to rescue Jamie and the leopard whose DNA may hold the key to curing the animal crisis.

The team discovers a shocking mutation that threatens the life of one of their own.

Jaime and Logan arrive at Caraquet, but things are not what they seem. The group tries to save Chloe.

The team travels to Portugal where they square off against a dangerous venom dealer in order to get one step closer to the cure. Also, Jackson's increasingly erratic behavior jeopardizes the entire team.

Mitch helps Jackson look into his past in their continuing quest for the cure. The rest of the team searches a small town in England for the triple helix.

Jackson learns his mother is missing in Africa; a hostile force takes over the team's plane; Jamie discovers a shocking secret about Abraham.

Jackson faces the most difficult decision of his life. Also, Mitch reluctantly enlists help from his father, Max Morgan (Robin Thomas), to investigate the origin of the final set of triple helix animal bones.

General Davies tries to find Jackson before Mitch and Abraham to prevent the team from making a cure. Jamie, Dariela and Allison try to persuade the Russian government to drop out of the Noah Objective.

Mitch and Jamie find themselves in the middle of an animal attack at the Russian Embassy in Washington, D.C. Meanwhile, Jackson finally gets the answers he's been looking for...and it's from a surprising source.

The team races the clock to find Clementine and vaccinate her before the TX gas reaches the general population.