Frequently, the star of one Apogee game will make a cameo appearance in
another.  Or, sometimes, someone from the real world shows up.  A list of
such cameos follows.  Appearances of Apogee characters in the default
scoreboards of games are not mentioned here, however, since there would be
too many to list.

      WARNING: much of the fun of these games is running across these
      things during play.  Do not read this section if you want to be
      surprised!

      
From Apogee:

 Game                      Description
 ----                      -----------
 Death Rally               Duke Nukem.  (Also listed in the "Heroes" section.)
 Wacky Wheels              The Dopefish, from Keen, (voiced by Joe Siegler). *
 Bio Menace                Commander Keen as one of the hostages in episode 2.
 Bio Menace                Scott Miller, George Broussard, and Jim Norwood, in
                           episode 2; also artifacts from other Apogee games
                           including Keen and Duke.  Yorp aliens from Keen
                           are there, among other things, as is a portrait
                           of Duke Nukem on the wall.
 Monster Bash              Epic's Jill of the Jungle is mentioned in the story.
 Cosmo's Cosmic Adventure  Duke Nukem, in episode 2, level 7.
 Duke Nukem                Commander Keen, mentioned by Dr. Proton in the
                           first episode.
 Crystal Caves             Keen's helmet, partially hidden by debris. *
 Secret Agent              Commander Keen, mentioned in the instructions.
 Paganitzu                 Yorp from Keen: Vorticons; also Keen's helmet.

      
From 3D Realms:

 Game                      Description
 ----                      -----------
 Max Payne                 Dopefish, in act 1, chapter 7.
 Shadow Warrior            Duke Nukem, mentioned by Lo Wang.
 Shadow Warrior            Lara Croft, star of "Tomb Raider," in the shareware
                             episode.
 Duke Nukem 3D             Dopefish, mentioned shareware episode, level 5.
 Duke Nukem 3D             Space marine, from "Doom," in level 3.
 Duke Nukem 3D             Death monk, from "Rise of the Triad," in the
                             shareware episode.

      
From Pinball Wizards:

 Game                      Description
 ----                      -----------
 Balls of Steel            Duke Nukem, in one of the tables.

 * - See the "secrets and other fun things" section for instructions on
     seeing Wacky Wheels' Dopefish cameo.
   - See the section on the history of Crystal Caves and Secret Agent for the
     background behind Crystal Caves' Keen helmet cameo.

     From Other Companies:

 Game                      Description
 ----                      -----------
 Hyperspace Delivery Boy   Dopefish
 Commander Keen Gameboy    Dopefish
 Anachronox (Eidos)        Dopefish
 Battlezone (Activision)   Dopefish
 Descent 3 (Interplay)     Dopefish
 Daikatana (Ion Storm)     Dopefish
 Quake III Arena (id)      Dopefish, although not as recognizable as usual.
 Quake II (id Software)    Dopefish, mimicking Keen in Doom II.
 Quake (id Software)       Dopefish, in episode 2, level 3.
 Doom II (id Software)     Commander Keen, at the end of level 32.