The Doctor’s mobile emitter helped him break free from the confines of sickbay and the holodeck. Our intrepid Doctor, much to his chagrin, was a one-trick pony for most of the first two seasons of Voyager. Despite his first integration into the ship’s holodeck for the episode “Heroes and Demons,” and again merged with an alien technology to fight the diabolical clown in “The Thaw,” Doc mainly stayed in sickbay.