Here is the movie plot summary for Blondie Knows Best: Blondie Knows Best is a 1940 American comedy film directed by Frank R. Strayer and starring Penny Singleton, Arthur Lake, and Shemp Howard. The film follows Dagwood Bumstead (Arthur Lake), the lovable but hapless husband of Blondie (Penny Singleton). In this installment, Dagwood poses as his boss, Mr. Dithers (Jordan Craner), to facilitate a major business deal that requires Dithers' presence. As part of the scheme, Dagwood must avoid Jim Gray (Joseph Devlin), a nearsighted process server who is hot on Dithers' tail. Meanwhile, Blondie is oblivious to her husband's deception and is busy dealing with her own set of misadventures at home. Chaos ensues as Dagwood struggles to keep up the charade and navigate the complexities of his own identity. Throughout the film, the Bumsteads' signature blend of wacky humor, physical comedy, and witty banter keeps audiences entertained. The film also features a memorable supporting cast, including Shemp Howard's iconic turn as the befuddled Mr. Dithers. In the end, Dagwood's scheme comes to fruition, but not without plenty of hijinks and hilarity along the way.