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Alien Carnage (also known as Halloween Harry) is a follow-up to the 1985 game Halloween Harry, created for the Microbee System by John Passfield in 1985, but it has very little in common with the original game.

In this side-scrolling platformer, earth is being invaded by aliens who turn humans into zombies in order to enslave them. Harry is the only saviour of earth, and he has to traverse different levels and rescue the kidnapped humans. There are many different weapons to collect, and most have a limited amount of ammo.


Alien Carnage Windows Opening story
Alien Carnage Windows This is a checkpoint
Alien Carnage Windows Entering mission 1: sewers
Alien Carnage Windows Title screen

Promo Images

Alien Carnage Screenshot
Alien Carnage Screenshot
Alien Carnage Screenshot
Alien Carnage Screenshot

Alternate Titles

  • "Halloween Harry" -- Original/Alternate title

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Freeware release

On May 24, 2007 Alien Carnage was released as freeware by 3D Realms with the permission of John Passfield. The game had previously been discontinued from their product line on April 21, 2000 due to it having problems running on Windows. They recommend using DOSBox to run the game on Windows 2000/XP/Vista.

Halloween Harry

Before it was named Alien Carnage, the name of the game was Halloween Harry. The name was supposedly changed so the game would have more appeal all throughout the year rather than just Halloween. The two versions play exactly the same, but Alien Carnage swapped Block 1: Office and Block 3: Sewers, as well as rotating the music for Blocks 1-3 around.


The music in Halloween Harry was done with .mod files, slightly altered to not play in a standard mod player

Release history

This game's first publicly available version as Halloween Harry was version 1.1 released on October 10th 1993. Version 1.0 of the shareware version was an incomplete version released only to a UK magazine.

When the game was released as Alien Carnage, it's version 1.0 release was released on November 2nd 1994.


The 3rd level boss, a "sentry droid", is labelled THX-1138 -- George Lucas's first movie, made even before Star Wars. (This is a common injoke in the game industry.)

Shareware content

A shareware version of Alien Carnage was released which had "Block 1: Sewers" playable. Halloween Harry's shareware version had "Block 1: Office" playable. Due to this, half the game ended up being released as shareware.


The game includes a "Studio.exe" file in its directory (originally included as a bonus for acquiring the full version of halloween harry) which allows you to play all the music from the game.

Information also contributed by Scaryfun, Tomer Gabel, WildKard, Xantheous, Yakumo and Zovni

Related Web Sites

666gonzo666 (61591) added Alien Carnage (Windows) on Jul 05, 2015
Other platforms contributed by Accatone (5351)