They didn't just have themes, they had opening songs which described the plot to the newly watching.
Just sit right back and you'll hear a tale,
A tale of a fateful trip
That started from this tropic port
Aboard this tiny ship ...
source: http://www.lyricsondemand.com/tvthemes/gilligansislandlyrics.html
A horse is a horse, of course, of course,
And no one can talk to a horse of course
That is, of course, unless the horse is the famous Mr. Ed.
source: http://www.lyricsondemand.com/tvthemes/mredlyrics.html
Just sit right back and you'll hear a tale,
A tale of a fateful trip
That started from this tropic port
Aboard this tiny ship ...
source: http://www.lyricsondemand.com/tvthemes/gilligansislandlyrics.html
A horse is a horse, of course, of course,
And no one can talk to a horse of course
That is, of course, unless the horse is the famous Mr. Ed.
source: http://www.lyricsondemand.com/tvthemes/mredlyrics.html