John Christopher was a male Human who lived on Earth during the mid-20th century. Christopher was a Captain in the United States Air Force, and the father of astronaut Shaun Geoffrey Christopher. He also had two daughters.
When the USS Enterprise was thrown back in time to 1969, Captain Christopher was sent in an F-104 Starfighter to intercept what the Enterprise considered by the United States Air Force to be a large UFO. (TOS episode: "Tomorrow is Yesterday")
Christopher's son Shaun followed his father's career path into the Air Force, before becoming an astronaut and later a founding member of Starfleet. (ST performance: Star Trek Live) Whenever Shaun went into space, he took John's dog tags with him. (TOS novel: The Rings of Time)
He was still alive in 2020. By this time, he had at least three grandchildren, Katie, Kevin and Rory, all of whom were Shaun's children by his former wife Debbie Lauderdale. In 2021, Shaun married his fellow astronaut Alice Fontana and had two other children, one of them being James Kirk Christopher-Fontana. (TOS novel: The Rings of Time)
- The Last Unicorn RPG module: A Cadet's Guide to Sector 001 Earth indicates that the Titan city of Christopher's Landing is named after John Christopher, but mistakenly indicates that John was "the first man to journey to Saturn" instead of Shaun Geoffrey Christopher.