Warning: Wikipedia contains spoilers
Plot Summary for the first movie:-
In the first movie, a group of teenagers return to a summer camp to prepare it for reopening. Many years earlier, a young boy called Jason drowned at a summer camp, and shortly thereafter, the two counselors responsible were murdered by an unknown assailant, after which the camp is closed. One by one, the new counsellors are brutally murdered, it transpires, by Jason's mother, Pamela.
Jason returns from the dead, and hacks and slashes through numerous other victims in nine of the ten sequels. The exception is the fifth film in the series, where the serial killer is merely a copycat of Jason, rather than the man himself.
The film series