Turtle Rock Studios has teased a bit of their Left 4 Dead successor Back 4 Blood already, but did you know that the devs had another project in the works that was sadly canned before moving on to Back 4 Blood?

YouTube channel Unforgotten Games just released a new video detailing the cancelled game known as Invaders or Invader. According to the video, between 2015 and 2016, some members of Turtle Rock Studios had been busy on the pitch, which was supposed to be for PC, Xbox One and PlayStation 4. The game was likened to Left 4 Dead, but was set in the UK, and instead of zombies, you fought giant aliens.

The studio had apparently been hiring for the game, which was presumably in full production by 2016. The project had concepts already drawn up, with a basic PvE campaign and narrative. Each character had a unique set of abilities, including access to futuristic technology that gave them appropriately futuristic weapons. Each character would also have specific roles, such as a medic or a heavy.

The game would apparently also make use of procedural destructive environments, similar to what you would’ve found in the Red Faction series. There, of course, would also have been a variety of aliens in both scale and in function, including an alien that would have been created out of trash.

Sadly, like many other projects, this one was never even announced, and probably didn’t make it past the initial hurdles of approval. Still, it makes you hope that Back 4 Blood will utilize some of the concepts they came up with in this one. Back 4 Blood is currently in development for PC, current gen and next gen consoles.

This content was originally published here.