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.
#1Commander Keen in Invasion of the Vorticons: Marooned on Mars
#2Commander Keen in Invasion of the Vorticons: The Earth Explodes
#3Commander Keen Complete Pack
#4Commander Keen: Invasion of the Vorticons
#5Commander Keen in Invasion of the Vorticons: Keen Must Die!
#6Commander Keen in Keen Dreams
#7Commander Keen in Goodbye, Galaxy!: Secret of the Oracle
#8Commander Keen in Goodbye, Galaxy!: The Armageddon Machine
You’re hereCommander Keen: Goodbye Galaxy!
#10Commander Keen