Beach Blanket Bingo (released 14 April 1965): the fifth Beach Party movie.
“Frankie and Annette, the once perfect couple who now seem like bickering, long-married discontents, constantly find themselves reassessing their relationship.
Romantic complications ensue with the introduction of a rising pop singer, Sugar Kane (Linda Evans), and a female skydiver (Deborah Walley), both of whom enjoy a brief flirtation with Frankie.
Bonehead (Jody McCrea), usually limited to the supporting sidekick role, gets more exposure here (not a good thing) in a storyline that has him falling in love with a mermaid (Marta Kristen).
The remaining story threads involve press agent Bullets (Paul Lynde) and his attempts to get Sugar Kane front page coverage while motorcycle gang leader Eric Von Zipper (Harvey Lembeck) concocts a plan to kidnap the singing star.” TCM.