Duke Nukem: Episode 3 - Trapped in the Future is the final episode in a Duke Nukem trilogy and was developed and published by Apogee Software in 1991 for DOS only. The game utilizes the same engine as the game Crystal Caves.
Alien Carnage (also known as Halloween Harry) is a follow-up to the 1985 game Halloween Harry, created for the Microbee System by John Passfield in 1985, but it has very little in common with the original game.
Cosmo’s Cosmic Adventure is a side-scrolling platform game developed and published by Apogee Software and released for DOS in 1992. The game has many references to another Apogee title, Duke Nukem (one of my favorites), throughout.