There aren't many places where you can find a Vault Boy from the "Fallout" series debating the merits of "New Vegas" with a member of the Justice League.

Okay, maybe those spaces are more plentiful these days — it's almost as if there's a comics convention happening somewhere at any given moment. But Portland's Rose City Comic Con stands apart.

The city's homegrown comics celebration kicked off its fifth year — sixth overall — at the Oregon Convention Center Friday, adding a third day to the festivities for the first time since its inception.

Wizard World, which hosts similar gatherings across the country, usually draws a paltry crowd for its opening nights. By contrast, Rose City Comic Con opened its doors at 1 p.m., and by early evening the show floor was packed with festival-goers.

Spider-Men, Wonder Women and all manner of comic book, video game and movie heroes wandered the venue as strangers asked for photographs. The hustle and bustle was evident in all but one area: The celebrity guest quarters.

That's because only a handful of stars — mostly voice actors — were on hand for Friday's festivities.

Saturday is when "Weird Al" Yankovic, William Shatner and Peter Capaldi will join Troy Baker, Charles Martinet and several others for photos and autograph signings, which can top $80 for some of the bigger names.

Add to that the troves of geeky merch, scores of artists selling prints and a retro gaming corner and the Convention Center might just be the hottest ticket for nerds across the state.

Last year, Rose City drew more than 36,000 guests. With one more day tacked on in 2017, it won't be surprising if organizers top that.

Rose City Comic Con takes over the Oregon Convention Center Sept. 8-10. Tickets are $30-$40 for a one-day pass, $65 for the weekend. Hours are10 a.m. to 7 p.m. Saturday and 10 a.m. to 5 p.m. Sunday.

--Eder Campuzano | 503.221.4344

@edercampuzano

ecampuzano@oregonian.com