S13, E23: In the 13th season finale, to the chagrin of the County General staff, the new chief, Moretti (recurring guest star Stanley Tucci), makes some major changes in the emergency room. Meanwhile, Kovac puts his honeymoon on hold when he must travel back to Croatia to be with his ailing father. Gates is urgently called home when Sarah (recurring guest star Chloe Greenfield) panics that she might be taken away. And after a patient convinces her to attend an antiwar rally, Neela finds her life in peril.