It's been 55 years since Gilligan's Island debuted on September 26, 1964. Hard to believe this gem-of-a-show is that old, but it's longevity is no fluke. The show's humour still stands up today. Most of the main cast and visitors to the island have passed away, but some remain to this day. Here's a then-and-now summary of many of the cast members . Lots you'll remember - some you might not. So "sit right back..."