Barbara Brinson is a USS Vancouver lieutenant who dates Boimler while under the influence of an alien parasite and later befriends Mariner.
Barbara Brinson is a human lieutenant serving on the USS Vancouver, and she had previously dated Jet Manhaver. In Cupid's Errant Arrow, Boimler introduces her to Mariner as his new girlfriend while the Cerritos and the Vancouver work together on the demolition of an unstable moon.
Mariner doubts that Barbara is sincerely interested in Boimler and becomes obsessed with proving it. She discovers that an alien parasite attached to Boimler has been influencing Barbara. Once it is removed, Barbara leaves Boimler, and she and Mariner discover they have a lot in common. She was voiced by Gillian Jacobs.