In that capacity, he conducted an inspection of the USS Enterprise after its return from a battle with the USS Reliant, which had been commandeered by Khan Noonien Singh. It was during this inspection that Morrow informed James Kirk and his crew that the Enterprise was going to be decommissioned.
Admiral Morrow was portrayed by Robert Hooks in Star Trek III. He was intended to reprise the role in Star Trek IV, but was later replaced with Admiral Cartwright. It is unclear whether or not Morrow resigned his commission as a Starfleet admiral and was succeeded by Cartwright by the time of Star Trek IV: The Voyage Home.
Morrow is the only Starfleet admiral to be referred to by the prestigious title of "the Commander of Starfleet", although it is unclear as to the specific function of the position. It is perhaps equivalent to the position held by Admiral Bill in Star Trek VI: The Undiscovered Country, or Admiral Leyton in DS9: "Paradise Lost", though this is conjecture and unsupported in canon.