ANNOYING NEW CHARACTERS BROUGHT IN TO SAVE A SHOW THAT RUINED IT

No particular order
  1. Scrappy Doo
    Jerk
  2. Cousin Oliver on Brady Bunch
    Ruined It
  3. Olivia on the Cosby Show
    Hated her even worse than Pam
  4. Alex and Nicky on Full House
    They could never duplicate the magic of Michelle
  5. Andrew on Family Ties, Chrissy on Growing Pains
    Magical growth spurts, too cutesy to be true, completely unnecessary
  6. I know there are more but can't think of them right now....