While suspended, Callen is kidnapped and interrogated by Iranian agents led by Naseem Vaziri. They believe Callen possesses a file identifying an Iranian spy in Tehran.

The episode begins with the Office of Special Projects (OSP) in disarray. Callen is suspended and facing charges of murder and treason, while Henrietta "Hetty" Lange has retired from her position.

It is revealed that Janvier’s death was faked by NCIS and the CIA to convince the Iranians that Callen was a rogue agent they could buy. Callen offers to trade Janvier for his own and Hetty’s lives.

The trade is executed, and Callen is released. Hetty rejoins the team after her "fake" resignation, and Callen’s suspension is lifted. Key Episode Details

The Season 4 premiere, titled " Endgame ," serves as the high-stakes resolution to the Season 3 cliffhanger. Originally aired on September 25, 2012, this episode follows the immediate aftermath of Special Agent G. Callen’s public shooting of the chameleon-like arms dealer, Marcel Janvier. Plot Summary: The "Endgame" Revealed