Jim Goodwin played Lieutenant John Farrell, a navigator aboard the Enterprise, in three first-season episodes of The Original Series: Mudd's Women, The Enemy Within and Miri.
Jim Goodwin was one of several young actors tried out in recurring bridge roles during the first months of The Original Series. As Lieutenant John Farrell he sat at the navigation console beside Sulu before the arrival of Chekov in the second season.
Farrell is introduced in Mudd's Women, where he is among the crewmen most visibly distracted by Harry Mudd's three passengers. In The Enemy Within he is on the bridge and helps to overpower the savage half of the divided Kirk, and in Miri he remains aboard the ship as the link between the stranded landing party and the Enterprise computers.
The character was not used again after Miri, and the navigator's seat passed to a series of other officers.