While it isn't the most successful of the Marvel franchises, the X-Men franchise is most certainly the oldest, with the first movie being released in 2000. Since then, the fans have seen five X-Men movies, plus two spinoffs focused on Wolverine, who was already the star of the ensemble flicks.

And since this shared universe is not watertight (just like the MCU attempts to be), there are quite a few inconsistencies in the continuity, especially between the original and the second trilogies. And this wouldn't be so bad if X-Men: Days of Future Past hadn’t tried to erase the timeline completely "“ it did try, but it failed, and it raised even more questions.

Well, after two weeks in the US, these continuity conundrums may have had the last word, since poor word-of-mouth is based especially on the fact that the movies, at this point, make no sense. And it appears that the blockbuster X-Men: Apocalypse was supposed to be will actually be a flop in the US (just $122 million in two weeks).

So, what is driving this franchise into the ground? Here is a list of the most annoying continuity errors, from the first X-Men movie through the last.

As always, here be spoilers!