Lieutenant John Farrell served as a bridge officer aboard the USS Enterprise (NCC-1701) in 2266. Something of a generalist, he served as navigator (TOS: "The Enemy Within") and as the relief communications officer. (TOS: "Miri") Farrell unintentionally supplied Magda Kovacs with a communicator, that would be used by Harry Mudd, to contact Ben Childress on Rigel XII. (TOS: "Mudd's Women")
- Farrell was played by actor Jim Goodwin