The Emergency Command and Tactical Holographic Program AK-1 Command and Tactical Subroutine Omega-323 Mark One (ECTH Mark I) is an experimental holographic program deployed on the USS Prometheus, known to the crew as "Lou" - a nickname, based on the name of his creator Doctor Lewis Zimmerman, given to him by Captain Logan MacLeod. (Star Trek: Prometheus)


Starfleet Research and Development initiated the Emergency Command and Tactical Hologram study group, headed by Doctor Lewis Zimmerman and aided by the cooperation of Voyager's EMH, following Voyager's return to explore the possibility of developing a dedicated Emergency Command Hologram. To this end the study group first selected, at random, a Mark I EMH and approached it with the ECTH upgrade proposal. Upon its acceptance the EMH was outfitted with autonomy protocols, data buffers and a reinforced matrix like Voyager's EMH to prevent degradation from long term use. It's medical database was replaced with an advanced diplomatic and tactical database, which included seven million tactical responses, five hundred first contact scenarios, five hundred command scenarios, the collective information of ten thousand combat situations and two hundred fifty peaceful first contact encounters, and the experience of one hundred individual Starfleet officers as well as contingency and adaptive programs to allow the ECTH to learn while serving as a commanding or tactical officer.

Essentially, the ECTH is a "back-up captain" and "back-up tactical officer", intended to take command of the ship or control of the weapons system in the event of the current command crew, or tactical officer, being incapacitated for some reason. The ECTH possesses information from the tactical databases of all the major strategists in Starfleet, and can incorporate them into its plans for controlling the ship and/or weapons systems.

When serving as a tactical officer and not a commanding or watch officer the ECTH's uniform collar would change color from command red to support services gold.


"Please state the nature of the command or tactical emergency."
— Lou (Upon activation)
"I am the Emergency Command and Tactical Holographic Program, but you can call me Lou."
— Lou


Images of actors are used to simulate the "crew" in Star Trek Prometheus. As a result The ECTH Mark I is portrayed (like Doctor Zimmerman, Voyager's EMH, and all Mark I EMH's) by Robert Picardo.

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