Blondie's Big Deal is a 1949 American comedy film directed by Edward Bernds and starring Penny Singleton, Arthur Lake, Larry Simms, Marjorie Ann Mutchie.

Dagwood unwittingly paints his boss Mr. Radcliffe's barn with the wrong paint as a test; and with Mr. Radcliffe watching, sets the barn on fire, only to have it burn down, disgracing Dagwood.

Blondie then, using an assumed name, is hired as a secretary in the con men's office, where she records their incriminating conversation.

She rushes to Mr. Radcliffe's office, where the con men are in the process of selling him Dagwood's nonflammable paint, which they claim is their invention.

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