Alyson's breakthrough came when she landed the role of Dan Akyroyd's daughter in the film, "My Stepmother Is an Alien." Other film credits include "Dead Man on Campus." In television, Hannigan has guest starred on "Roseanne," "Picket Fences," and "Touched by an Angel." She has also held a recurring role on the series "Almost Home" (formally "The Torkelsons") and was a series regular on "Free Spirit." TV movie credits include "For My Daughter's Honor," "The Stranger Beside Me," and "Switched at Birth."
A Washington, D.C. native and Dr. Seuss fan, Alyson enjoys surfing the web, practicing kick-boxing, and spending time with her dogs and cats. She currently lives in Los Angeles.