Fatal Obsession

S4, E6: Charles meets Alex, a beautiful coed, when they both are counselors on a weekend camping trip. After they return to town, Alex relentlessly pursues Charles, even though he repeatedly tells her he already has a girlfriend and is not interested in dating anyone else. When Jamie mentions she is dieting, Alex, who works at a health food store, offers to move into the Powell house to be her personal nutritionist. Alex later approaches Charles with the "good" news, but he asks her to leave. The final straw comes when Charles and his girlfriend, Stephanie, have a double date with Buddy and Stephanie's new friend, who turns out to be none other than Alex.