"It was a little odd," Anderson told Newsweek for its July 21 issue. "It was more disconcerting than I anticipated. I expected it to be a breeze. But I tried so hard since the series ended to do things as different as possible from the character.

"When I was faced with making acting decisions on that character again, my brain started backfiring and internally combusting," she said.

Anderson, who is pregnant with her third child, said she has also been spending time buying and selling houses in London, California, Canada and elsewhere.

"I like doing up houses and getting into the architecture," she told the magazine.

"The X-Files" ran from 1993-2002 on the Fox network. Anderson reunites with co-star David Duchovny for "The X-Files: I Want to Believe," the second feature film spun off from the paranormal series.

The movie will be in theaters July 25.