"The Sound of Quacking" finds the castaways threatened by a blight that is destroying all the food on the island, resulting in meager rations that please no one. The arrival of a migratory duck doesn't help matters much, as the Professor's insistence that a message attached to his leg can effect a rescue doesn't ease grumbling stomachs. This seventh episode introduces a staple of the series that the cast members loved most of all, a dream sequence allowing them to play different characters, in this case a hilarious spot on satire of GUNSMOKE, complete with Marshal Gilligan, limping deputy Skipper, and typical villainous turns from Mr. Howell and the Professor (Alan Hale and Russell Johnson were old hands at Western baddies). Ginger makes for a fetching Kitty-type red headed dance hall hostess, Mary Ann the virtuous heroine who loves the Marshal, Mrs. Howell failing to hide her patented duck gravy from prying eyes. A moment of seriousness arises when Skipper offers Gilligan an axe to chop off the duck's head, torn between head and heart with his fellow castaways starving. More entries dealing with famine would be forthcoming, but none so good as this one.