The last chance to snag passes to Comic-Con International in San Diego arrives Thursday at 8 a.m. PT when canceled and returned badges go on sale for the July 12-15 convention.

There are, however, a few major caveats: Only those people who registered for a Comic-Con Member ID by last week's deadline can participate; anyone who's already purchased a four-day badge or a Saturday badge can't take part in the resale; and ... just 5,000 single-day badges are available. Badges sold out the first time within an hour and 20 minutes.

Convention hopefuls who signed up for and confirmed their Member IDs should've received an email last night to the resale location, which won't go live until Thursday at 8 a.m. PT.

That all means, of course, that there will be no on-site registration. Convention organizers are also tightening security this year to to clamp down on counterfeit badges and illegal resales. So attendees should be prepared to provide photo ID that matches the names on their badges.