This weekend the Tucson Convention Center was filled with people who dressed up as their favorite character.
John Olson and his brother Jim say they usually come every year to Comic-Con. However, this is the first time John Olson decided to wear a Star Trek costume, based off one of his favorite shows.
"I love science and math and its all about technology and the future and that's the area that I work in. I work in computers so it's something that is close to my heart."
One of the many special guests who were signing autographs and taking pictures with fans was Gates McFadden, starring in Star Trek.
The Olson brothers were able to meet her after making sure they were first in line.
"I was a little nervous. She was very interactive and nice."
Comic-Con will continue to run until Sunday.