A condescending, white-haired, pot-bellied human specializing in dolphin Uplift, Metz is an observer assigned to the exploration vessel Streaker. On Earth before the flight, Metz leads efforts to incorporate Stenos bredanensis DNA in Tursiops amicus stock. He has a reputation for favoring Stenos dolphins and shows special interest in Vice-Capt. Takkata-Jim, a Stenos into whom he has secretly grafted genes from Orcinus orca (killer whale).