Hagan's first feature is one she is best known for among horror fans, her role as Kara Strode in the 1995 horror sequel Halloween: The Curse of Michael Myers, her character is an adopted cousin of original Halloween character Laurie Strode.
[6] She has also appeared in Dinner and a Movie, in which she played the lead role, I Think I Do, and Rick, which stars Bill Pullman.
In 2006 she appeared in the horror trailer Dead Calling, in what was intended to become a feature film, which didn’t reach fruition.
Hagan explained in the podcast series Happy Horror Time, the intention of a feature-length film and that it was mistakenly added to IMDb as such, for which it is unable to be removed.
As a journalist, Hagan has written pieces for the arts and culture magazines, including BlackBook (for whom she interviewed such figures as Lou Reed)[9] and Room 100.