Orion Prime is a 1 level demo. It's for version 1.4/1.5 and the file is 1.1MB in size. The file name is orionprm.zip. It was released on March 16, 1998.

Orion Prime has good level design and gameplay. There is nothing new here just a good Duke TC. There is a two level version I have but could not get the second level to work correctly yet. I rate it as good with 3 out of 5 stars.