The TWO Dicks.......
It happened in September 1969, when Dick York was in bad back pain and he asked to be relieved of his contract and quit the show becasue of the shooting demands, Dick Seargent c ame on board and they had a bad fire on the set destroying the house and office sets, so they took a road trip to Salem, Mass. to attend the witch trials with the New Dick...wiki i, it's interesting