Unbelievable! This is a master class in designing Marathon architecture - the best architecture I have seen in a Marathon game. This game has the most classic, yuge set-piece battles. You can play these battles over and over till you're covered in phor blood and gore and the floor is slippery with compiler guts and you can't breathe from the stink of alien carcasses, and the moans of the shp't wounded as you crush thier skulls is sweet heaven. This is a top drawer scenario. PLAY IT AND SEE.
A 17-level single player scenario. The predecessor to Marathon: Phoenix. Many assets for Phoenix came from this, as well as some of the storyline beats, like that of the Renegades and a poorly written evil AI.
This scenario was released back in September 2006. It's hard, and it's not very good; fixes and updates went into Phoenix instead. This is presented just as a historical document, I guess.