The Lost Duke Episodes is for version 1.4/1.5. It has 40 levels and the file is 419KB in size. The file name is lstdke20.zip. It was released on August 27, 1997.

The Lost Duke Episodes has good level design and gameplay. For the most part it uses the regular Duke textures. There is a mission briefing and supply level in each episode. Some levels are short and there are some well designed traps. There is a lot of weapons, ammo, and health to be found. In later episodes there are aliens that have new or different attacks and there is a weapons canister that will either explode, drop a weapon, or drop a atomic health. I rate it as good with 3 out of 5 stars.