EMH Doctor

The Emergency Medical Hologram 'Doctor', or EMH Doctor for short, was a crewmember aboard the USS Voyager who wasn't all there. Literally.

The EMH Doctor was a hologram, brought online after the entire medical staff were killed during the process of Voyager being flung to the far corner of the Trek Galaxy. Despite only being programmed to be a temporary supplement for a Doctor in the event of an emergency, the Doctor soon had to cope with being the full-time Chief Medical Officer for the entire crew, and it took its toll on his programming. However, after finding a love of opera and developing his own personality, the Doctor was soon able to adapt to overcome this problem and before long he was a fully-fledged member of the crew.