Plot summary
At the park, Malcolm meets a depressed middle-aged man named Leonard ( Jason Alexander ) who has much in common with him. Fearing that this might be his future self, Malcolm tries to help Leonard to improve his life. Lois cannot understand why she is gaining weight in spite of her dieting attempts. Dewey keeps playing stunts, using the excuse that the baby "told" him to. Lois is about to punish him, saying the baby is not talking to him, when Dewey tells her the baby "says" to look behind her, revealing Hal has deliberately been making her gain weight (finding her growing curves arousing). Francis gets a swelled ego when he and Piama find employment as nude models.
Credits
Adapted from Wikipedia contributors, Malcolm in the Middle season 4. HTML formatting and reference markers removed.