Agent O

Agent O appears in Men in Black III and Men in Black: International. She is a veteran agent of the organisation, becoming chief of the New York branch of the MiB after Zed's passing, and was a secretary in the 1960s to Zed's predeceesor Chief X. Agent O was previously romantically involved with Agent K, but at the present time, this has since ended.

She was portrayed by Emma Thompson in the present day, and by Alice Eve in the 1960's scenes of MIB 3.