Dr. Leonard “Bones” McCoy, portrayed by DeForest Kelley, remains one of the most memorable Starfleet officers due to his sharp wit and firm stance on professional boundaries in “Star Trek: The Original Series.” His famous catchphrase, “I’m a doctor, not a [fill in the blank],” often humorously highlighted the unrealistic demands placed upon him by Captain Kirk. This iconic line, possibly inspired by a 1930s film, has been a recurring theme across the “Star Trek” franchise, resonating with fans and characters alike.

Dr. McCoy’s list of things he’s not is as colorful as it is extensive. Throughout the series, he reminds everyone that he’s not a psychiatrist, mechanic, engineer, bricklayer, coal miner, magician, moon shuttle conductor, or an escalator. This comedic trope was later picked up by Dr. Julian Bashir in “Deep Space Nine.” In the episode “Past Prologue,” he begins, “I’m a doctor, not—” before being interrupted. In “The Wire,” he tells Jadzia, “I’m a doctor, not a botanist,” and during “Trials and Tribble-ations,” he humorously declares, “I’m a doctor, not a historian,” while navigating time travel. Dr. Phlox, played by John Billingsley in “Enterprise,” also joins the fun, asserting, “I’m a doctor, not an engineer.”

The tradition continued in “Star Trek: Voyager” with the Emergency Medical Hologram, simply known as The Doctor, portrayed by Robert Picardo. With a vast database of skills, The Doctor humorously insists he is not a bartender, butler, decorator, voyeur, counterinsurgent, commando, zookeeper, dragonslayer, exorcist, battery, performer, or doorstop, among many other things. This running gag showcases the blend of humor and character depth that makes “Star Trek” beloved by its audience.