Jason Voorhees is the central antagonist in the 'Friday the 13th' series. Known for his iconic hockey mask and machete, Jason is the relentless killer who haunts Camp Crystal Lake. His tragic backstory involves drowning as a child due to negligent camp counselors, which fuels his vengeful spirit. Jason is portrayed as virtually indestructible, often returning from the dead to continue his reign of terror. His character embodies fear and suspense, making him a legendary figure in horror film history.