Shows whose theme song should have been "Let It Go"

Today's most telling 20th century fact:

"There was a reunion movie in 1978 called Rescue from Gilligan’s Island and another in 1979 called Castaways on Gilligan’s Island. Both were of dubious quality but commanded high ratings. The third and final reunion movie, The Harlem Globetrotters on Gilligan’s Island (1981), bombed."