In 1996, she appeared in a lead role in The Craft, in which her character formed a teenage coven with characters portrayed by Neve Campbell, Rachel True and Robin Tunney. Since then, Balk has continued to find roles, primarily dark ones. In 1996, she co-starred in The Island of Dr Moreau. In 1998, played a neo-Nazi goth-punk opposite Edward Norton in American History X, and was featured in The Waterboy, alongside Adam Sandler. Since 2000, she has appeared in over a dozen films. She has also done voice work for animated films, TV shows and video games, including Justice League, Family Guy, Grand Theft Auto: Vice City and Lords of EverQuest. The 2007 documentary Return to Oz: The Joy That Got Away was dedicated to her.