Lisa Whelchel, Parker Stevenson “Poor Rich Man” two-part Greece episode of The Love Boat (1983) 

This is the full double episode when Lisa guest starred as “Caroline Shea” in a two-part cruise to Greece episode called “Isaac’s Aegean Affair / The Captain and the Kid / Poor Rich Man / The Dean and the Flunkee."
Gilmore College is having its graduation ceremony aboard the Love Boat. The valedictorian (Parker Stevenson), whose education was lovingly financed by his Greek aunt (Eva Marie Saint) whom he assumed was wealthy, learns she's in fact just a woman of humble means. When she arrives on board, he unwisely does not tell anyone who she really is, not even his girlfriend Caroline (Lisa Whelchel).
Other guest stars: Eddie Albert, Debbie Allen, Shirley Jones, Leigh McCloskey, Jimmy McNichol, Billy R. Moses, Eva Marie Saint and Parker Stevenson. Originally aired in February 1983. Season 6, Episodes 18 and 19.
Fun Fact: Lisa was in another episode of The Love Boat, “The Racer’s Edge” (1985).