Which show is a spin-off of 'NCIS'?

In 'ALF', what planet is ALF from? In 'Mork & Mindy', which planet is Mork from? Which show is a spin-off of 'The Cosby Show'? Which show is a spin-off of 'Perfect Strangers'? Which show is a spin-off of 'Grey's Anatomy'? Which series is a prequel to 'Yellowstone' set in the 1880s? Which 'The Walking Dead' spin-off is set initially in Los Angeles? Which Amazon series is set in Tolkien's Second Age of Middle-earth?