Larisa Oleynik is an American actress best known for her role as Alex Mack in the popular 1990s television series The Secret World of Alex Mack. The show, which aired from 1994 to 1998, followed a young girl who gains special powers after a chemical spill. Oleynik's performance earned her recognition and a dedicated fan base. In addition to her television work, Oleynik has appeared in several films, including 10 Things I Hate About You and The Baby-Sitters Club. She has also made guest appearances on various TV shows, showcasing her versatility as an actress throughout her career.