Michael Adler

While on Air Force One, a Navy Commander dies. Agents from the Navy NCIS decide to take the investigation into their own hands and force Secret Service Agent Kate Todd to help. The NCIS team then has to figure out if the Navy Officer's death was of natural causes or not.

Hotch's unexplained absence quickly becomes apparent when the team is called back together to profile a killer targeting an emergency room doctor.

A corpse discovered at the bottom of a gorge forces the lab into lockdown when it begins to discharge an unknown substance.

Ryan, Marissa, Seth and Summer are back to begin their senior year at The Harbour School, but while everyone else celebrates the last days of summer, a dark cloud hangs over the foursome.

Berg throws a fake 30th birthday party for Pete so that he can get closer to his longtime crush Bethany.

Although they are finally happy with each other, Marissa and Ryan are forced to stay apart by their parents. Elsewhere, Dean Hess pressures Seth and Summer into showing their Harbour School spirit, which leads them to devise a covert plan.