A young Starfleet lieutenant sharing a quiet transporter station with Uhura in 2285, who ends up locked in a closet when she beams Kirk's party to the Enterprise.
The officer Uhura calls Mister Adventure appears in Star Trek III: The Search for Spock. He is on duty with her at a little-used transporter station on Earth and complains that the place is a dead end. He cannot think why an officer of her record asked for it, and supposes her career is winding down.
Then Kirk, McCoy and Sulu walk in, the last two fresh from a jailbreak. As the lieutenant protests, Uhura draws a phaser and orders him into the closet. She sends the others up to spacedock and remains behind to cover them.
The character has no other name on screen and is credited by the nickname. He was played by Scott McGinnis.