Magnum, P.I. (1980)

After Agatha and her friends are swindled out of $100,000 by a shady investment company, she hires Thomas to track down the crooks and retrieve their money; Higgins's distant cousin arrives to marry the heir of a local socialite, and turns out to be a punk rocker in need of a drastic makeover before she can be accepted into society, giving Higgins and Agatha only a few days to play Pygmalion and turn his common cousin into a proper lady before the wedding.