Local Arizona authorities seek help from the team to locate a methodical killer. Plus, Hotch is in the running for the new BAU unit chief.
MacGyver must try to de-activate a Soviet era warhead in Moscow with an ancient computer. He encounters problems when the computer stops working.
Deacon awaits his pending jail sentence as Rayna is in a coma. Meanwhile, Teddy grapples with Peggy's pregnancy and Gunnar's proposal complicates his relationship with Scarlett.
A group of scientists are trapped in Hawaii after an earthquake. Mac and the team try to rescue them while another group try to steal the secret weaponry the scientists are working on.