Billy Murphy is the machete-wielding mass murderer and the main antagonist of the 2015 slasher comedy movie The Final Girls. He serves as the main villain of 2 fictitious 1980s slasher films titled "Camp Bloodbath" and "Camp Bloodbath 2: Cruel Summer". He is also a classic parody of another horror icon Jason Voorhees of Friday the 13th fame.

He is portrayed by Dan B. Norris, and his younger self (credited as "Young Billy") is played by Eric Michael Carney

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