- Main Article: Emil
EMH Mark I
Deep Space 9
Although she swore she'd never use the program, Dr. Beverly Crusher activated the USS Enterprise-E's EMH program when she needed to buy time for her, her staff, and patients to escape from sickbay when the Borg threatened to overrun it.
When confronted, he managed to distract the invading Borg anyway, by offering them analgesic cream for the severe skin irritations that Starfleet Medical research indicated that Borg implants caused. His program then fritzed as he was scanned by the incoming drones. (Star Trek: First Contact)
When the Equinox crew decided they wanted to take advantage of nucleogenic lifeforms to enhance their warp drive, they deleted the EMH's ethical subroutines in order to have it study the creature and optimize the effects their remains had.
After Equinox encountered the USS Voyager, the formerly injured Noah Lessing commented on how The Doctor was an "outstanding EMH," joking to Seven of Nine that "ours can barely hold a laser scalpel." (VOY: "Equinox", "Equinox, Part II")
- Main Article: The Doctor
Emergency Medical Hologram Replacement Program
- Main Article: Emergency Medical Hologram Replacement Program
EMH backup module
Following the determination that the Mark I's were defective, according to their creator in 2375, Lewis Zimmerman, "I tried to have them decommissioned, but Starfleet in its infinite wisdom overruled me and reassigned them all to work waste transfer barges. That's where you'd be too, if you hadn't been lost in the Delta Quadrant. Do you know how humiliating it is to have 675 Mark Is out there, scrubbing plasma conduits, all with my face?" (VOY: "Life Line")
In 2378, The Doctor later considered his authorship of the holonovel Photons Be Free as a social commentary, written on behalf of the "hundreds of EMH Mark Is" in the Alpha Quadrant, who were "identical to me in every respect except, they've been condemned to a menial existence. Scrubbing conduits, mining dilithium." He further drew a comparison of their plight, through his work, to that found in The Vedek's Song, which told the story of the Occupation of Bajor.
Some of those "condemned" to mining dilithium were stationed at a Federation mining colony, these programs were able to obtain bootlegged copies of Photons Be Free. One of the EMH miners found the holonovel "provocative". (VOY: "Author, Author")
EMH Mark II
To address the flaws in the EMH Mark I, Dr. Zimmerman began work on the Mark II, a prototype of which was finished in time to be included in the sickbay of the USS Prometheus in 2374, six weeks before the ship was stolen by the Romulans. (VOY: "Message in a Bottle")
While the Mark I's outward appearance was a copy of its inventor, a disillusioned Dr. Zimmerman changed the outward appearance of the Mark II. Furthermore, the patterns of behavior of the following versions were designed to be more pleasant and courteous. To achieve this, Zimmerman initially tried to improve on the programming of the Mark I, but eventually decided to create the Mark II from scratch. (VOY: "Life Line") In addition to that, new ship designs like the Prometheus-class enabled full mobility for the EMH, as the whole ship was outfitted with holographic projectors. (VOY: "Message in a Bottle")
Deep Space 9
- Main Article: LMH test program 1