Episode 5: Dimension of the Past (called "DOPA" for short) is an add-on episode for Quake developed by MachineGames, to commemorate the game's 20th anniversary. It's available to download for free.
Despite not being developed by id Software themselves, the episode is considered semi-official, being developed by a fellow Zenimax-owned company that has previously co-operated with id Software. The episode also contains many allusions and callbacks to Quake proper, such as the re-appearance of the Dopefish easter egg, along with the final level of the episode being almost identical to Shub-Niggurath's Pit.
- The Military Base
- The Power Supply
- The Dark Days
- The Catacombs
- The Stronghold
- The Underworld
- The House of Doom (secret level)
- The Otherworld
- The Year Zero
- 2016-06-24, Wolfenstein: The New Order developer releases new Quake episode. Polygon, accessed on 2016-06-27
|Expansions of Quake|
|Quake||Scourge of Armagon · Dissolution of Eternity · Dimension of the Past|
|Quake II||The Reckoning · Ground Zero|
|Quake III||Team Arena|