1989-91 MS-DOS computer game series. Played today in the DosBox emulator. Reached its apotheosises with NETKEEN.

List of official Commander Keen games

• Commander Keen 1: Marooned on Mars
• Commander Keen 2: The Earth Explodes
• Commander Keen 3: Keen Must Die!
• Commander Keen: Keen Dreams
• Commander Keen 4: Secret of the Oracle
• Commander Keen 5: The Armageddon Machine
• Commander Keen 6: Aliens Ate My Babysitter!

List off unofficial versions released since

• Short Circuit Oracle
• Terror from Outer Space
• NETKEEN