He happens to be a Baldwin relative, and after a visit succumbs to the effects of their "Recipe".
Jenny Pendleton (Sian Barbara Allen), whose mother died years ago, runs away from her father and new stepmother, back to her deserted house in Walton's Mountain.
Jenny and John-Boy meet and fall deeply in love, but she is soon traumatized by her father's sudden accidental death, and ultimately moves away with the stepmother.
The Waltons shelter a deaf girl (Erica Hunton) left on their back porch by her mother because her father insists on institutionalizing her.
While they search for her family, they start teaching her sign language, which she uses to help Elizabeth when an emergency arises.
Grandpa Walton takes it as a sign of his own impending death; Ben takes it as a sign he will win the fourth-grade spelling bee; and an unscrupulous relative of the sisters first plans to exploit the meteorite for financial gain, then tries to steal their "Recipe machine".