[Raul] "One of the many ideas surrounding M1A1 that never made it to the final cut, was to make a secret level recreating Marathon Zero (aka Marathon Alpha). I was able to take 29 shots of orange spider-thing that lurks in this early version of the game, which I end up using in the read me file. These pics might be useful for someone else. Each pic include it's own alpha channel and are in photoshop format (no layers)." Low resolution.

Note: apparently since submission this monster has been used in a special edition of M1A1. Be certain to include appropriate credits if you use it.