"The Barracuda" was the episode that introduced Lynn Hamilton as registered nurse Donna Harris, who has spent enough time with Fred for him to propose marriage. Unwilling to let Donna stain the memory of his late mother, Lamont believes his father to be too old to get married again: "I'm Sagittarian and she's a Leo, Sagittarian is the hunter, and Leo is the lion, so I got me a lion" "it sounds more like she's Pisces the fish and she's the Barracuda!" Fred enthuses about her ability in cracking his neck and big toe at the drive-in: "with all that cracking going on, I'm surprised they didn't throw you two out of the theater!" Lamont expects lifelong bachelor Melvin (Slappy White, second of five) to back him up, but he's all for the wedding, especially to a nurse! The necessity of moving out once they're married forces Lamont into a tricky corner.