• Many TV shows have one episode that changed everything. For example, the How I Met Your Mother finale retroactively altered the entire narrative, killing off the Mother and opening the door for Ted and Robin.
  • Doctor Who was changed for the worse when it revealed the Doctor's mysterious childhood, as the plot point felt messy and uncomfortable.
  • Chevy Chase's departure from Community had a significant impact, causing a decline in quality and the show's future, whereas Charlie Sheen's exit from Two and a Half Men allowed for a fresh direction for the sitcom.