An excellent episode featuring Joan Prather who played Janet on "Eight Is Enough". She is one of three girls whose car breaks down, and can't be fixed till the next day. With his parents away, and Potsie pushing him, Richie agrees to take them in.
The boys try to figure away to "get together" with them, and all efforts fail dismally. Mr and Mrs return early, and Howard gets quite a surprise both in his bedroom and his bathroom.
The boys effort to keep Ralph out (while Fonzie took one for a bike ride) is also very good.
A very enjoyable show, that shows how good this series could be. Compare it to any later episode of Season 4 and onwards, and you'll know how far it came down to reach the lowest common denominator to attract viewers.
Fonzie, like seasoning, is just right when using the correct pinch.