- See Johnson for other articles with titles that contain, either by relationship or by coincidence, this character's surname.
Mark Johnson was born in 2333 and was raised in Bloomington, Indiana by traditionalist parents and lived in an agricultural community. When he was six, he lost a pet dog and he had a very difficult time getting over it. While a youth, he went by the name "Hobbes". Johnson attended The Meadows school and when he was nine, he began taking tennis lessons with Epkowicz, but refused to quit even though Epkowicz told him to. Two years later, he was taking lessons with coach Cameron, who also coached Kathryn Janeway.
In 2349, Johnson was swimming with Kathryn Janeway in a cave system under Olympus Mons on Mars. When trying to find an entrance to an underground cave, Johnson was pulled into a trench and Janeway saved his life by helping him get out.
In 2351, Johnson began attending Indiana University. He still played tennis occasionally, but he was a part of the school's prestigious swim team. He graduated from Indiana with a degree in philosophy.
By 2371, Johnson and Janeway were engaged. Following the disappearance of the USS Voyager, Johnson was devastated, but he held out hope that Janeway and the rest of the crew were alive longer than most people did. Eventually he realized that he was clinging to a fantasy. He began living his life again, meeting people and letting go of the past.
In early 2374, Johnson married a woman who worked with him. He was relieved when it was revealed that Voyager hadn't been destroyed and was in fact trapped in the Delta Quadrant. He sent a letter to Janeway, telling her what had happened in his life and that he was sorry. (VOY episode: "Hunters")
In an alternate reality in which the Cardassian Union did not withdraw from Bajor in 2369 and Voyager was not sent to the Delta Quadrant in 2371, Janeway and Johnson had married by 2373. Johnson cared for her dog Molly while she was aboard Voyager. In 2373, he was widowed when the ship was destroyed by a fleet of Cardassian Galor-class warships armed with phased polaron beam weapons near the Dorvan sector. (TNG - Myriad Universes novel: A Gutted World)