In the original Friday the 13th (1980), Mrs. Pamela Voorhees (Betsy Palmer) stalks and murders the teenagers preparing Camp Crystal Lake for re‑opening.
She is determined to ensure that the camp does not reopen after her son Jason (Ari Lehman) drowned in the lake due to the negligence of two staff members.
The last counselor, Alice Hardy (Adrienne King), fends off Mrs. Voorhees long enough to grab a machete and decapitate her.
In Friday the 13th Part 2 (1981), Jason (Steve Daskewisz/Warrington Gillette) is revealed to be alive and fully grown.
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After killing Alice Hardy, Jason returns to Crystal Lake to guard it from all intruders.
Five years later, a group of teenagers arrive at Crystal Lake to set up a new camp, but Jason murders them.
Ginny Field (Amy Steel), the last counselor Jason attempts to kill, finds a cabin in the woods with a shrine built around the severed head of Mrs. Voorhees.
Ginny fights back and slams a machete through Jason’s shoulder.
Jason is left for dead as Ginny is taken away in an ambulance.
During the events of Friday the 13th Part III (1982), Jason (Richard Brooker) removes the machete from his shoulder and finds his way to Chris Higgins’ (Dana Kimmell) local homestead.