Premise: 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". She was also the last actress to play Liza Walton Sentell on the long-running soap opera "Search for Tomorrow".
Hypothesis: Danielle Atron was the main antagonist on "The Secret World of Alex Mack."