There's no doubt about it: the Walton girls are growing up, and at least two of them have developed a healthy interest in the opposite sex. In fact, when John-Boy invites young forestry student Chad Marshall (Michael O'Keefe in his first series appearance) to stay with the Waltons, Mary Ellen (Judy Norton-Taylor) falls head over heels in love with the handsome visitor. The trouble begins when Mary Ellen's sister Erin (Mary Elizabeth McDonough) also sets her cap for Chad. ~ Hal Erickson, Rovi