Assault on Tei Tenga

Assault on Tei Tenga, also known as Tei Tenga, is a hub-based mapset for ZDoom created by Sam Ketner. It is widely considered as the first WAD to use the ZDoom hub system inherited from Hexen, combined with ACS-scripted cutscenes, which was not a simple proof of concept. Due to this, it is listed as one of the Top 100 WADs of All Time by Doomworld. Released on May 21, 1999, it originally received mixed responses, with some community members complaining that extensive scripting interfered with Doom's gameplay. Nevertheless, Tei Tenga has been described as "the wad that got ZDoom on its feet".

You're on your way out to some R&R when General Burns diverts your shuttle to Tei Tenga to investigate a loss of communications....