 When the show originally aired, the animated opening credits were  changed each season to include the current sponsor. The credits  shown on the currently syndicated version of the show eliminate  these sequences. Originally the sequence began with a cartoon of the  sponsors logo and a voice over saying "Chevrolet (or Quaker Oats or  Aunt Jemima or Oscar Mayer...) presents." Ending the credits, after  the cartoon smoke with Agnes Moorehead (qv)s credit (where the  credits in the syndicated version stop), was a brief cartoon ad for  the sponsor.