The BAU must act fast when a rapid acting bio-weapon is sent to the local PD in a non-descript envelope. A case of suspected terrorism takes a dangerous turn when the local PD starts dropping one by one, with un-diagnosable symptoms, and a team of military doctors completely stumped. The team begins to realize that this isn't just another case, and procedure may not save them.

A mother's desperation sent two prisoners down to earth alone. Now, after almost a year on the ground, resources on the ark are failing, and the remaining prisoners are sent to the ground in a last ditched effort to save the human race. When worlds collide, Clarke and Murphy must try to form an alliance between the grounders and the sky people

A mother's desperation sent two prisoners down to earth alone. Now, after almost a year on the ground, resources on the ark are failing, and the remaining prisoners are sent to the ground in a last ditched effort to save the human race. When worlds collide, Clarke and Murphy must try to form an alliance between the grounders and the sky people.