Editing Commander Keen (section)

===Cancelled and compilation releases===
After the release of ''Goodbye, Galaxy'' and ''Aliens Ate My Babysitter'' in 1991, id Software planned to make a third set of episodes for the following December, titled ''Commander Keen in The Universe is Toast!''. Beyond the proposed title and release date, shown in the epilogue of the two games, no design work was completed before the game was cancelled due to the success of id's ''[[Wolfenstein 3D]]'' (1992) and development focus on 3D [[first-person shooter]]s such as ''[[Doom (1993 video game)|Doom]]'' (1993).<ref name="3DRretro"/> John Carmack noted in 1999, when referencing the project that became the Game Boy Color game, that the original developers of ''Keen'' were unlikely to ever work together again on another game.<ref name="IGNrumor"/>

In 2019, at [[Bethesda Softworks|Bethesda's]] [[E3 2019|E3]] conference for iOS and Android devices held in June, a new game in the series was announced, again titled ''Commander Keen''. Under development by ZeniMax Online Studios, the mobile game was said to include tactical strategy elements and have both single-player and multiplayer gameplay, and star Keen's twin son and daughter, Billy and Billie. It was planned for release in the summer of the same year, but no release or further announcements were made, and all references to the game were removed from Bethesda and ZeniMax websites by June 2020.<ref name="KeenAnnounce"/><ref name="CKcancelled"/>

In addition to the initial releases of the games, several compilation releases have been published: the ''id Anthology'' compilation in 1996, which includes all seven episodes developed by id or Ideas from the Deep; a compilation release by Apogee in 1998 of the five episodes of ''Invasion of the Vorticons'' and ''Goodbye, Galaxy''; and the ''3D Realms Anthology'' in 2014, which also includes ''Vorticons'' and ''Galaxy''.<ref name="Compilation1"/><ref name="Compilation2"/> The Apogee-published episodes have also been released for modern computers through a [[DOS]] emulator, and sold through [[Steam (service)|Steam]] since 2007 as the ''Commander Keen Complete Pack''.<ref name="Steam"/>