Shows rarely end in the same place they begin. Shakeups to the status quo are a tale as old as time and major changes to the world are often interesting ways of allowing consumers to see how the characters will roll with the major shakeup they've been dealt. However, some of these changes need not be abrupt.

Sometimes a show may include something fantastical for a little shakeup. Say, for example, a gritty detective show spent the entirety of its first season only dealing with mundane, worldly cases, but now features an actual wizard with real magic as a suspect in Season 2. The case is solved, the status quo remains in place, everyone moves along. But then in Season 3, it's revealed that this wizard was part of an order of wizards. Now in Season 4, the wizards show up more frequently. Now in Season 5, wizard magic is an occasional but still routine part of the show. By Season 6, wizards and magic have become a core part of the show's setting. The fantasy has crept in and can no longer be separated from the world.