On the 13th of each month, I write about a movie whose title contains the number 13.
Friday the 13th: A New Beginning turned out to not be Jason at all, the series' producers went out of their way to definitively bring him back in Friday the 13th Part VI: Jason Lives. It's right there in the title, and the movie opens with doomed survivor Tommy Jarvis (now played by Thom Matthews, replacing John Shepherd, who replaced Corey Feldman) exhuming Jason's grave, ostensibly to make sure that he's dead. A quick lightning strike later, Jason is up and lumbering about again, now a completely supernatural force (which at least explains why he is super-strong and essentially invincible).
Previous Friday the 13th posts:
Friday the 13th (1980)
Friday the 13th Part 2 (1981)
Friday the 13th Part III (1982)
Friday the 13th: The Final Chapter (1984)
Friday the 13th: A New Beginning (1985)