A storyline from the first 5 episodes of Mister Rogers’ Neighborhood, which seems quite relevant a half-century later, as summarized on Wikipedia:

Lady Elaine’s changes to the geography of the Neighborhood of Make-Believe worry King Friday, who begins to impose new rules and restrictions in Make-Believe, and builds a wall.

Meanwhile, King Friday worries about an invasion of people who want to change the Neighborhood of Make-Believe and drafts her (Lady Aberlin) as a border guard.

Because of the new rules and restrictions in Make-Believe, Cornflake S. Pecially refuses to visit the castle. Chef Brockett delivers a cake to King Friday, who is suspicious of more changes, cuts the cake into many pieces to inspect it.

At the Neighborhood of Make-Believe, King Friday still wants to protect his province, so he sends Handyman Negri to install punch clocks at both ends of it.

Betty Aberlin takes some helium balloons to the Neighborhood of Make-Believe. Tagging them with a message of peace, she floats them above the castle. When King Friday reads the message, he ceases his efforts to stop change. The wall is taken down.