Lieutenant McMillan was an astronaut working for the NASA in the late 20th and early 21st century.

She was a member of the same NASA class as Shannon O'Donnel. During her training, she suffered from claustrophobia, which she later got over.

Unlike O'Donnell, McMillan remained with NASA and was to be the co-pilot on a joint mission with the European space agency in 2003, during which she'd spend four months on the International Space Station. Gerald Moss met with O'Donnell in December 2000 and updated her on McMillan's career since O'Donnell saw her last, having spoken with McMillan and other members of their class recently. (VOY: "11:59")

This character was only mentioned in dialogue.
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