NCIS

A farmer on a tractor sees an unattended intact Marine helo inside a crop circle on his land. While Gibbs and company investigate, a burned-out cabin turns up, as does a charred body.

One of the team goes missing while working undercover. After briefing the NCIS team on the investigation connected to this event, an LAPD detective is killed by a car bomb.

After a mysterious hit squad takes out a special agent on assignment, the NCIS team jumps into action before the next target is set.