Lieutenant Walter Baxter was a Starfleet officer on board the USS Voyager when it was pulled into the Delta Quadrant in 2371.
A workout enthusiast, Baxter suffered an injury that year while exercising in the ship's gymnasium. In sickbay, Baxter directed all his questions to Kes, and was quite dismissive of The Doctor , questioning whether or not a hologram could perform the duties of a flesh-and-blood doctor, such as perform surgery. Later, when Baxter reported to sickbay again for another workout-related injury, The Doctor informed him that, if he were to suffer another injury due to failure to restrain himself during workouts, The Doctor would be forced to discuss the matter with Baxter's superior officer, a statement which forced Baxter to acknowledge The Doctor as the chief medical officer.
When Voyager discovered a Human settlement on a planet in the Delta Quadrant, Captain Janeway decided to let any crewmember who so desired to remain behind. Theorizing about which members of the crew would decide to leave the ship, she speculated that Baxter would be one of them, describing him as a "risk-taker" who would be eager to take on the challenge of building a new life on the planet. However, to Janeway's pleasant surprise, not one member of the crew chose to leave Voyager.