Jon's fiancee intended to sell her deceased Uncle Horace's house, but Uncle Horace came back as a ghost and was looking for something. He suggested to Olivia that they call the Ghostbusters, but she insisted that they get rid of Uncle Horace themselves. In the end, the Ghostbusters captured a ghost haunting Horace's house and helped Uncle Horace discover that what he needed was to say goodbye to his niece. After Uncle Horace peacefully dispersed, Jon decided to keep the house instead of selling it.
Jon notably gets names wrong, as he has referred to the Ghostbusters as the "Ghost Smashers" and the National Intruder as the "National Inquisitor." He is also very cowardly and easily frightened by ghosts.
- On page four of Ghostbusters Issue #5, Jon makes a non-canon in Manhattan.
- Marsha Goodman (1987). Episode Call Sheet and SAG Report - "Who's Afraid of the Big Bad Ghost?" (1987).
- Olivia Stewart (2009). The Real Ghostbusters- Who's Afraid of the Big Bad Ghost? (1987) (DVD ts. 1:53-1:55). Time Life Entertainment. Olivia says: "That's the National Intruder, Jon."
- Jon (2009). The Real Ghostbusters- Who's Afraid of the Big Bad Ghost? (1987) (DVD ts. 17:27-17:30). Time Life Entertainment. Jon says: "My fiancee Olivia Stewart recently inherited this estate."