Appears in: 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), Friday the 13th Part VI: Jason Lives (1986), Friday the 13th Part VII: The New Blood (1988), Friday the 13th Part VIII: Jason Takes Manhattan (1989), Jason Goes to Hell: The Final Friday (1993), Jason X (2002), Freddy vs. Jason (2003)
Scariest moment: Oddly enough, Jason's scariest moment happens long before he ever finds that hockey mask or even makes his first kill. It comes at the end of 1980's Friday the 13th, when, after decapitating the film's murderer, Mrs. Voorhees (Betsy Palmer), final girl Alice (Adrienne King) tries to relax on a drifting canoe; seemingly about to enter a peaceful dreamland, Alice suffers one more shock as the rotted corpse of young Jason rises out of the water and pulls her into Crystal Lake.
Weakness: Bad actresses who love showing off their boobs during sex and shower scenes.

Making his first official appearance in Friday the 13th Part 2, the ubiquitous slasher Jason Voorhees has since become one of the horror genre's most iconic and instantly recognizable figures. Yet, the question of whether he's actually scary or not has always been in discussion. How terrifying can an undead slayer be when, by the fifth or sixth movie in his franchise, his methods of killing repeatedly border on self-spoofing?

Just try asking that question to Mr. Voorhees himself as he's about to plunge that machete into your forehead. Even though the Friday the 13th series jumped the proverbial shark a long time ago (see: Voorhees' absurd outer space adventure in 2001's Jason X), the concept of a muscular, unstoppable zombie wearing a hockey mask will forever be the stuff of nightmares, at least in theory.