Joe believes David's social-studies teacher has gone overboard to instill a fear of nuclear disaster in his students; Sam sees Kay's visiting mother as an aging hippie and fears Kay could follow in her footsteps; and Lindley invents an infant walker.

Lindley and Jim's efforts to market the baby walker meet with stumbling blocks; Joe is protective of David after a vagrant attacks the boy in the park; Kay feels remorseful after selling a dilapidated home to a young couple; Sam tires of constant surprises in his marriage.