Can't name a "worst."
I actually enjoy the old reruns esp the 70s police/detective shows like Mannix, Banacek, Cannon, Barnaby Jones, Columbo, McMillan & Wife, Kojak, Ironside, Mod Squad, Starsky & Hutch, Baretta, The Rockford Files, Police Woman, The Streets of San Francisco, Adam 12, Mission Impossible...
There's a classics channel which plays most of them. I love 'em!
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Recovery Board