Commander Keen: Goodbye Galaxy!
Following the Invasion of the Vorticons, the story arc of Goodbye Galaxy! takes Commander Keen to a planet to rescue the Keepers of the Secret of the Oracle, which know the location of the Shikadi's doomsday device, The Armageddon Machine.
- Developer: id Software
- Publisher: Apogee Software
- Released: 1991-12-15
- Genres: Platform, Adventure