Edward Furlong
Edward Furlong played John Connor in Terminator 2: Judgement, and he won a Saturn and MTV Movie Award for the role. However, despite having such a promising start to his career, he fell victim to alcoholism and substance abuse in his late teens and early twenties.
Erika Christensen
Erika Christensen is probably best known currently for her role as Julia Braverman on NBC's Parenthood. Her breakout role was in the film Traffic, and she won an MTV Movie Award for Breakthrough Female Performance. She's only had smaller TV roles since Parenthood and currently stars in Ten Days in the Valley with Kyra Sedgwick.