I think I'm approaching the end of episode 1: "Dr. Mangle's Lab"! :0)
"Legacy:
Apogee released the game as freeware on December 23, 2005 as a "Christmas present", and the full game can be downloaded from the Apogee website. On 23 October 2014, 3D Realms released 3D Realms Anthology, which includes Bio Menace".. from Wikipedia
