The Glass Bottom Boat is hardly a high point in the careers of star Doris Day and director Frank Tashlin, though it is a better-than-usual example of that pure-'60s genre, the "spy spoof." Day plays Jennifer Nelson, a PR worker at NASA in Florida. She also doubles as a "mermaid" for her father, Axel (Arthur Godfrey), the skipper of a glass-bottom tourist boat. While garbed in her skimpy mermaid costume, she has a run-in with handsome space technician Bruce Templeton (Rod Taylor). Through a series of misunderstandings, Bruce is led to believe that Jennifer is an enemy spy, determined to steal scientific secrets. Several other characters enter into the plot, including bumbling secret agent Julius Pritter (Dom DeLuise) and prissy security chief Homer Cripps (Paul Lynde). Also on hand are TV favorites Dick Martin as Jennifer's erstwhile beau and Eric Fleming as a man of mystery. A few cute celebrity cameos round out this ribtickler, while Doris Day, as always, gets a few opportunities to sing.