Crossovers  GamesCommander Keen
War Against Extinction by Lyrium eidolon reviews
Commander Keen, having learned of Mortimer's survival, prepares to rebuff his next attack. However, after being captured by aliens claiming him to be a wanted man, he must rise to defeat the Grand Intellect's plans for destruction of the universe.
Rated: T - English - Adventure/Sci-Fi - Chapters: 4 - Words: 5,715 - Reviews: 1 - Updated: 10/15/2015 - Published: 4/25/2015 - Billy B., Commander Keen, OC
ISOTA by Bablet reviews
A fresh start/new beginning. See inside for details. What is it, to be a stranger to oneself? Billy Blaze, known throughout the galaxy as the heroic Commander Keen, finds himself internally alienated from his family and friends... And he's not alone.
Rated: K+ - English - Sci-Fi - Chapters: 3 - Words: 2,291 - Reviews: 13 - Favs: 3 - Follows: 3 - Updated: 6/28/2014 - Published: 11/14/2013 - Billy B., Commander Keen, Mortimer M.
A Whole Flock o' Trouble by Calorimeter
Mortimer tries to take over the world with a bunch of birds. Originally written for a contest put on by the Keen Fan group on DeviantArt.
Rated: K+ - English - Humor - Chapters: 1 - Words: 997 - Favs: 1 - Published: 2/28/2014 - Complete
Warpcore by Calorimeter
Keen seeks Mortimer McMire in the Warpcore to put an end to his plans to destroy the universe. This is a retelling of the final level of the fan-made TUIT series.
Rated: T - English - Adventure - Chapters: 1 - Words: 2,645 - Favs: 2 - Published: 2/22/2014 - Billy B., Commander Keen, Mortimer M. - Complete
Commander Keen episode 10: Hasta la Vista Heaven by StupidStory
When Keen dies from eating a piece of broccoli, God tells him that Mortimer McMire is scheming a plot to blow up heaven. Keen comes back and needs to find a way to stop his nemesis or else everyone who dies will have to go to hell when they die.
Rated: K+ - English - Humor/Sci-Fi - Chapters: 1 - Words: 2,217 - Published: 3/31/2013 - Mortimer M., Billy B., Commander Keen - Complete
The Morons Are Still Out There by Treacle Parcheesi reviews
Mortimer McMire has escaped the asylum! He sets out to steal something of great value to the peaceful and noble Fribbulans, and enslave them for eternity. In order for Billy to save them, he must learn the most important lesson of all.
Rated: K+ - English - Humor/Adventure - Chapters: 6 - Words: 7,805 - Reviews: 6 - Favs: 1 - Follows: 1 - Updated: 11/22/2011 - Published: 2/22/2011
Billy's Megarocket by mortimermcmirestinks reviews
Billy decides to make a megarocket.
Rated: K - English - Chapters: 1 - Words: 466 - Reviews: 6 - Favs: 2 - Follows: 1 - Published: 9/20/2010 - Billy B., Commander Keen