A Starfleet admiral who orders the Enterprise-D to rendezvous with a special emissary and deal with the Klingon sleeper ship T'Ong in The Emissary.
Admiral Gromek is a flag officer at Starbase 153. She appears on the viewscreen in the second-season episode The Emissary.
She diverts the Enterprise to meet a class 8 probe travelling at warp nine and refuses at first to explain why, saying only that an envoy is inside. The passenger is the half-Klingon ambassador K'Ehleyr, who brings the full story: the T'Ong, a Klingon ship launched seventy-five years earlier with its crew in stasis, is about to wake believing the Empire is still at war with the Federation.
No Klingon vessel can reach it in time, so Gromek leaves the matter to Picard. It is settled when Worf poses as the Enterprise's captain and orders the T'Ong to stand down.