It’s wasn’t hard to blend in Sunday at an Omaha metro-area comic convention — if you were dressed up as Spider-Man or just about any horror movie villain.

“The rest of us kind of stick out like sore thumbs,” said Mary Crowley of Omaha. “I’m just enjoying watching the crowd. There are some really fun costumes.”

In its fifth year, O Comic Con is starting to hit its stride, said organizer Rebekah Burchfield. She estimated that the three-day exposition at the Mid-America Center in Council Bluffs would finish with about 10,000 visitors, including children 12 and under who got in free with a paid adult.

“We’re having a really great weekend,” Burchfield said. “Saturday was really crowded, and today it’s a little more laid-back. It gets better every year as we strive to get a balance between guests who represent different areas of pop culture.”

This year’s show featured celebrities from film, television and wrestling, as well as creators from the worlds of comic books and graphic novels. Celebrity media guests included Kate Flannery, who’s known for playing Meredith on “The Office”; Sam Jones of “Flash Gordon”; and prolific voice actor Steve Blum.

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Creator guests included Alison Wilgus, Brent Peeples and Mark Russell. Special guests were Nebraska author Tosca Lee and comedy producer Ryan Copple.

Anneric Bowen of Bellevue wore one of the more unusual costumes, dressing as Glow Cloud from the podcast “Welcome to Night Vale.” Several people commented on her costume — a cotton-laden umbrella with animal figures dangling from fishing lines.

Night Vale is a weird fictional desert town where all conspiracy theories are real. No dogs are allowed in the dog park, and it’s best not to look too hard at the hooded figures scattered throughout the community.

“Glow Cloud is a god that rains animals and is part of the PTA in Night Vale,” Bowen said. “Some people know who I am. Others are just like, ‘I love your cloud.’ It’s all fun.”

Her friend, Clay Simons of Bellevue, chose to dress as a Ghostbuster, specifically Ray Stantz, who was played by Dan Aykroyd in the movies. Simons, 34, is a comic convention regular and plans to attend the Chicago show this summer.

“It’s great because everyone here is like me (playing a role),” Simons said. “I don’t feel like some little nerd sticking out.”

He succeeded Jim Henson as Kermit the Frog — and now he's coming to Omaha

Some visitors were more attuned to panel discussions with celebrity guests. Steve Whitmire, the actor and puppeteer who succeeded Muppets creator Jim Henson as Kermit the Frog, spoke to about 75 people about his roles.

In addition to Kermit the Frog, Whitmire performed as Muppets Ernie, Rizzo, Beaker, Statler and Wembley Fraggle. After nearly 40 years with the Muppets and more than 25 as Kermit, Whitmire began working on other projects in 2016.

Asked his favorite role, Whitmire quickly identified Rizzo, a character he developed on “The Muppet Show.” Rizzo is a streetwise and sarcastic rat with a New Jersey accent.

Whitmire found Rizzo in a box of puppets at the Muppet studio and inserted him into the background of a scene with Kermit that was being performed by Henson. At the end of the scene, Whitmire said, Henson broke out laughing at Rizzo’s antics.

“Jim said, ‘We’re going to make that rat a star,’ ” Whitmire said. “Rizzo was fun because he was sarcastic and snarky.”

For old-timers, the highlight of any comic convention might be actual comics. Dave White of Dave’s Comic Vault in Chicago made his second appearance at O Comic Con, bringing with him about 5,000 vintage comic books.

Looking for the first appearance of Wolverine? White has it in Issue 181 of the “Incredible Hulk” for $8,500. Another standout comic features the first appearance of the Avengers, autographed by Stan Lee no less, on sale for $5,950.

“It seems harder to get kids into comics,” White said. “They want to do everything on their phones now or they come because they want to dress up. I do see adults and their kids going through the boxes checking off their lists of what they need.”