- Harsher in Hindsight: The 2008 radio play Frozen in Time, which was set in 2013, was the final Journey into Space story written by Charles Chilton. It starred David Jacobs as Jet. Both men died in 2013.
- Values Dissonance: In The World in Peril, Jet tells the Martian that humans all over Earth have been conquered by other humans throughout history. He argues that in many cases, the conquered peoples were better off as their conquerors brought them civilisation when they were previously savages.
- The Woobie: Lemmy.
YMMV / Journey Into Space