So... Commander Keen is the Grandson of B.J. Blazkowicz, the main character of Wolfenstein 3-D.
And apparently, Doomguy is named Stan Blazkowicz, which means he's the Great^(n-2) Grandson of Commander Keen.
Ignoring the whole "All iD Software Games Take Place in the Same Universe" stuff... what the hell is the deal with the end of Level 32 in Doom II then?