Emergency Command and Tactical Hologram Mark I

The Emergency Command Hologram Mark One (ECH Mark I) is an experimentalholographic program deployed on the USS Prometheus.

History
Starfleet Research and Development initated an ECH 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 ECH upgrade proposal. Upon its acceptance the EMH was outfitted with autonomy protocols, like Voyager 's EMH, and its medical database was placed in "cold file" data storage and replaced with an advanced tactical database based on the one used for the ECH extention of the USS Voyager's Emergency Medical Hologram.

Essentially, the ECH is a 'backup captain', intended to take control of the ship in the event of the current command crew being incapacitated for some reason. The ECH possesses information from the tactical databases of all the major strategists in Starfleet, and can incorporate them into its plans for controlling the ship.

Note(s)
Images of actors are used to simulate the "Crew" in Defenders of the Federation. As a result The ECH Mark I is portrayed (like Voyager's EMH and all Mark I EMH's) by Robert Picardo.