On the ship , he incessantly demands bonuses for investigating the Derelict 's distress beacon .
Dennis Monroe Parker ( Yaphet Kotto ) is the Nostromo 's chief engineer ; Brett is his assistant .
On the ship , Brett incessantly demands bonuses for investigating the Derelict 's distress beacon .
Dennis Monroe Parker ( Yaphet Kotto ) is the Nostromo 's chief engineer ; Brett is his assistant .