when does ziva come back to ncis season 7
NCIS (season 7) In the first episode of season seven, Ziva is rescued by Gibbs, Tony and McGee and upon her return to Washington, she eventually becomes an NCIS agent after resigning from Mossad for good. Much of the season's story arc then focuses on the Mexican Drug War and Colonel Merton Bell (Robert Patrick), a suspected murderer who hired the lawyer M. Allison Hart to represent him. Hart quickly becomes a thorn in Gibbs' side by regularly showing up and protecting possible suspects while they are being investigated, claiming that they were her clients.
Till Death Do Us Part (NCIS) Gibbs decides to recruit convicted former officer Jonathan Cole based on Ryan's profiling of Dearing to lure him into a trap. It initially seems to have worked when Dearing tells Cole to meet him a cafe retired Navy officers attend, but Dearing doesn't show up to the meeting and instead leaves a phone for Cole. The former calls and tells Cole to relay a message to Gibbs that he was never interested in Director Vance and is really interested in justice. Back at headquarters, analyzing the call makes the team realize there is a bomb in Vance's car, installed when he was abducted, meant to blow up NCIS Headquarters at the Navy Yard and the whole building is evacuated. Cole attempts to defuse the bomb but is killed in the process (assumed), when the bomb detonates, while receiving a phone call indicating the bomb was for revenge against the Navy due to the death of his son, Evan, (revealed in "Up in Smoke") damaging part of the NCIS building with Gibbs and his team still inside. Ziva and Tony are in an elevator with debris falling on them after evacuating people, Abby and Gibbs are stuck in her lab, and Tim is just leaving his desk after securing a backup drive from his computer. Ducky receives a phone call about the attack and is asked to autopsy the bodies, but the shock and stress of the call causes him to have a heart attack and collapse alone on a beach, leaving everyone's fates unknown.