Herocon - '99 is a convention attended by the superheroes of Superzone in 1999. The convention was well-attended, with personalities such as Captain Ego and Muscleman making an appearance. Items on the agenda included "Secret Identities: Does Your Mother Know" and "Invisible Mending For Laddered Tights". Unfortunately, the convention was crashed by Jacko Lantern and the supervillains after the venue was double booked by the evil Meteor Destruction Man.
- The conference hall had a huge banner reading "Herocon - '99" across the front, so the confusion regarding the villains appearing should have been cleared up earlier.