While speaking about the growth of her character over the past five seasons with The Charlotte Observer, the 37-year-old actress said Annie's ability to evolve is what has kept the show interesting.
"We went from a mission of the week in the first season to an agent with five years of experience who is always evolving," she said. "Now, Annie has a superhero quality that at times borders on fantasy because she's so good."
In addition to bringing Annie to life, Perabo said she enjoys working in a television series because the cast is like a supportive family. The Coyote Ugly star described her costar and on-screen lover Christopher Gorham as "one of the nicest guys on the planet."
Covert Affairs' fifth season premiered Tuesday.