Keen 5 Story
From KeenWiki
Commander Keen 5: The Armageddon Machine starts right after Keen 4 ends. Having previously freed the Council Members from their exile in the Shadowlands and having had them activate the Oracle (see Keen 4 Story), Keen learned that the Shikadi (who attempted to kill, then exile the Council Members in Keen 4) are "a race of energy beings from the far side of the galaxy." (Interestingly, this contradicts the story at the end of the game, when the Shikadi "hightail it back to their own galaxy.")
The Shikadi are evidently aware of Keen, possibly because they caught him spying on them with his Photachyon Transceiver in Keen 4, where he first heard of their plans to destroy the galaxy. Either way, Keen rapidly heads to Korath III where the Omegamatic is being constructed in orbit around the planet. Once there he sneaks aboard the lower floors by landing in a small docking bay near the main exhaust.
Once onboard Keen goes nuts shooting all sorts of creatures and defences as well as the Shikadi. His aim is first to make it past the lower floors to the main deck, then to destroy each of the four main levels. (Each of which is protected by a defense tunnel.) This cuts power to the second elevator allowing Keen to use it to travel to the upper deck, where he may then attack the core of the Omegamatic, the Quantum Explosion Dynamo.
Ending
At the end of this episode, a suggestive announcement about The Universe Is Toast was made, but id Software moved on to bigger projects, such as Wolfenstein 3D, Doom and Quake, and so the promise was never fulfilled.
