The Simpsons Se21 Ep14 Postcards From the Wedge

Postcards From the Wedge is the fourteenth episode of Season 21, which aired on March 14, 2010. The episode was written by Brian Kelley and directed by Mark Kirkland.

When Homer receives a letter from Edna Krabappel saying that Bart is way behind in his studies, he tries to take a hard line with him, but Marge thinks he has too much work, so Bart finds a way to turn their difference of opinion into a full-blown fight, only for it to end up with the two of them deciding that they need to worry about themselves more than Bart – at least until Bart discovers that running trains on the old Springfield Subway is causing the school’s structure to crumble