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Beaver (Jerry Mathers) thinks it's real "creepy" that his brother Wally (Tony Dow) is spending less time with him and more time with his girlfriend Penny Jamison. But this state of affairs ends abruptly when Wally and Penny quarrel and break up. Now concerned only with his brother's best interests, Beav tries to patch the romance back together -- with the unexpected assistance of his pet toad, Herbie. Penny Jamison is played by Carol Sydes, who later changed her name to Cindy Carol and essayed the leading role in the 1963 theatrical feature Gidget Goes to Rome.