Eternal Doom began life as a 12-map episode for Doom II, produced by Team Eternal and under the direction of Paul Schmitz, the author of Artifact and Welcome to Hell. A number of WAD authors cleaved unto him, including Sverre Kvernmo, who is responsible for many of the new graphics (that is, the stuff not ripped from Heretic and Hexen). Eternal Doom was updated two more times, adding fifteen and six levels, respectively, to turn it into a mega-megaWAD. I know this project eventually came under the purview of Team TNT, but I have no idea when that happened. I'm guessing some time during the development of Eternal Doom II, but I have no basis for that assumption. For sure, Eternal Doom III was headed by TNT, given Ty Halderman's involvement.
