Long-haired philosophy professor's motorcycle date with Alison and her suspicious grandpa: should she be chaperoned?

A crossover episode with the cast of "Family Affair". Mr. French, Cissy, Buffy, and Jody's trip to Nairobi is interrupted when Interpol officers at Rome Airport, mistaking Mr. French for a jewel thief, detain them. Mike Endicott (John Forsythe) intervenes, only to be implicated as Mr. French's accomplice.