Point of No Return - The Doom Wiki at

Point of No Return is a single-level PWAD for Doom II, created by Michael Philleo (Job) for the ZDoom source port. It is a large techbase map, and represents an early attempt at emulating the style of Playstation Doom through the use of sounds from that version of the game but also the colored sector features from the ZDoom engine used to simulate similar environments. It uses a music track entitled "downlord" by Ubik (aka RocketMermaid).

Final Sin - The Doom Wiki at

Hell - The Doom Wiki at

MAP10: Onslaught (The Plutonia Experiment), Doom Wiki

E3M9: Warrens (Doom), Doom Wiki

Siphon Grenade, Doom Wiki

E1M8: Phobos Anomaly (Doom), Doom Wiki

Doom Slayer, Doom Wiki

Cyberdemon (Doom 2016), Doom Wiki

Cyberdemon (Doom), Doom Wiki

Doom's protagonists, Doom Wiki

Imp (Doom 3), Doom Wiki

The Ancient Gods, Part One - The Doom Wiki at

Doom 3: Resurrection of Evil, Doom Wiki

Point of No Return (1993 film) - Wikipedia

MAP11: Circle of Death (Doom II), Doom Wiki