That guy in the Spider-Man suit you posed with at Comic-Con? It might have actually been Harry Potter.

Daniel Radcliffe donned a Spidey mask to covertly mingle with fans on the showroom floor at the pop-culture convention in San Diego.

"I did an American accent for the whole time," the British actor said in an interview. "I even took a rucksack, so I look like I'm just coming to Comic-Con. I had a whole look. But it was great ... I took lots of pictures with people who did not know that it was me."

Radcliffe posed for plenty of photos with other costumed guests, and even inserted his Spidey-masked face into a poster for Sharknado 2.

"(It) actually looked weirdly good," he said. "It looked like Spider-Man is in Sharknado 2."

The 25-year-old star made his first trip to Comic-Con to discuss his new film, Horns, in which his character sprouts horns on his head that are invisible to others but cause them to confess to him their darkest truths.

A self-avowed superhero and comic book fan, Radcliffe said he has long wanted to come to Comic-Con. Members of the Harry Potter cast have appeared in previous years, but the franchise star was not able to make it until now. Besides promoting his new film, Radcliffe also got to indulge his inner geek while dressed as Spider-Man.

"I always loved that character. I love the comics, actually, as well," he said. "I almost got a picture with two girls dressed as Mary Jane and Gwen Stacy, but the moment had passed."