After 12 films and nearly 20 years,the X-Men franchise comes to a close with dusky Phoenix, a storyline which has already been told in a previous installment, and 2006's X-Men: The final Stand. That this is the Phoenix Force's second depart-around underscores a sometimes confounding lack of continuity from one film in this series to another — if you aren't looking carefully.
Source: blastr.com