Of course it lasted much longer, airing for 13 seasons, spawning several made-for-TV movies and coming back ... via Getty Suzanne Somers and Patrick Duffy on a 1994 episode of 'Step by Step ...

spawning several made-for-TV movies and coming back as a reboot from 2012 to 2014. Related: The Original Cast of 'Dallas': Where Are They Now? Duffy remembered that the day the original cast met ...