Marge offers her services as a babysitter and mother-figure to Rod and Todd but Ned question Marge's child rearing ability after she lets the boys play on a rock climbing wall. To add insult to injury, Bart gets pulled into a chimp cage at the zoo where he receives better treatment from a lonely ape than his own family. The Simpson and Flanders families join forces at the end to rescue Bart from the chimp who escaped with Bart to the church steeple.