Originally, Crystal Caves and Secret Agent were developed at George
Broussard's Company, Micro F/X.  The author, Frank Maddin, poked fun at the
Apogee/id game Commander Keen by including Keen's helmet in a level of
Crystal Caves, partially obscured by some junk and debris.  Half way through
the games' development (and after the helmet was put in), George Broussard
became Scott Miller's partner at Apogee and dissolved Micro F/X.  The
as yet unfinished games Crystal Caves and Secret Agent came with him to become
Apogee games.  Keen's helmet was left in as an inside joke.