When suburban couple Harry and Tacey King can no longer handle their three intractable sons alone, they hire a babysitter through an ad in the paper. Their new employee turns out to be Mr. Belvedere, an eccentric, vegetarian, yoga-practicing genius. Belvedere is a hit around the house, but when snooping neighbors begin to spread nasty rumors about him, the Kings' standing in the community is jeopardized.