/vr/ - Retro Games

Hey gents i'm trying to find a community wad series I can't remember the name of for the life of me. The last I remember it there were 3 main entries within the series and they all had hubs in which the player would walk through portals to get teleported to the respective levels. The first entry of the series finished off with a custom mecha-hitler boss that spammed rockets at you and the third entry had a render of doomguy from the 2016 game on the title screen. Would anybody happen to know the name of this series?