Louan Gideon ( November 12 , 1955 -- February 3 , 2014 ) was an American actress best known for her role as antagonist Danielle Atron on Nickelodeon 's `` The Secret World of Alex Mack '' .
Louan Gideon ( November 12 , 1955 - February 3 , 2014 ) was an American actress . She is best known for her role as Danielle Atron in `` The Secret World of Alex Mack '' .